First we prove the following Lemma 1. In a convex $n$-gon $A_{1} A_{2} \ldots A_{n}$ with area $S$ we have $4 S \leqslant A_{n} A_{2} \cdot R_{1}+A_{1} A_{3} \cdot R_{2}+\ldots+A_{n-1} A_{1} \cdot R_{n}$ where $R_{i}$ is the circumradius of the triangle $A_{i-1} A_{i} A_{i+1}, A_{0}=A_{n}, A_{n+1}=A_{n}$. Let $M_{i}$ be the midpoint of $A_{i} A_{i+1}$ for $i=1, \ldots, n$. For each $i$ we consider the quadrilateral formed by the segments $A_{i} M_{i}$ and $A_{i} M_{i-1}$ and the perpendiculars to this segments drawn through $M_{i}$ and $M_{i-1}$, respectively. We claim that these $n$ quadrilateral cover the $n$-gon. Indeed, let $P$ be a point inside the $n$-gon. Let $P A_{k}$ be the minimum among the distances $P A_{1}, P A_{2}, \ldots, P A_{n}$. We have $P A_{k} \leqslant P A_{k+1}$ and $P A_{k} \leqslant P A_{k-11}$, therefore $P$ belongs to the $n$-gon and to each of the two half-planes containing $A_{k}$ and bounded by the perpendicular bisectors to $A_{k} A_{k+1}$ and $A_{k} A_{k-11}$, that is, to the $k$-th quadrilateral. To complete the proof it remains to note that the area of the $i$-th quadrilateral does nor exceed $\frac{1}{2} \cdot \frac{A_{i-1} A_{i+1}}{2} \cdot R_{i}$. For our problem it follows that $4 S \leqslant 2 R_{1}^{2} \sin \angle A_{1}+2 R_{2}^{2} \sin \angle A_{2}+\ldots+2 R_{5}^{2} \sin \angle A_{5}$. Applying Cauchy-Buniakowsky inequality, we obtain $2 S \leqslant R_{1}^{2} \sin \angle A_{1}+R_{2}^{2} \sin \angle A_{2}+\ldots+R_{5}^{2} \sin \angle A_{5} \leqslant \sqrt{\left(R_{1}^{4}+\ldots+R_{5}^{4}\right)\left(\sin ^{2} \angle A_{1}+\ldots+\sin ^{2} \angle A_{5}\right)} \leqslant \sqrt{5\left(R_{1}^{4}+\ldots+R_{5}^{4}\right) \sin ^{2} 108^{\circ}}$ thus $\frac{4 S^{2}}{5 \sin ^{2} 108^{\circ}} \leqslant R_{1}^{4}+R_{2}^{4}+\ldots+R_{5}^{4}$. In the above inequality we made use of the following Lemma 2. If $\alpha_{1}, \alpha_{2}, \ldots, \alpha_{5}$ are angles of a convex pentagon, then $\sin ^{2} \alpha_{1}+\ldots+\sin ^{2} \alpha_{5} \leqslant 5 \sin ^{2} 108^{\circ}$. The sum in question does not depend on the order of the angles, therefore we may assume $\alpha_{1} \leqslant \alpha_{2} \leqslant \ldots \leqslant \alpha_{5}$. If $\alpha_{1}=108^{\circ}$, then $\alpha_{2}=\ldots=\alpha_{5}=108^{\circ}$, and the inequality turns to equality. If $\alpha_{1}<108^{\circ}$, then $\alpha_{5}>108^{\circ}$. Note that $\alpha_{1}+\alpha_{5}<270^{\circ}$ (if $\alpha_{1}+\alpha_{5} \geqslant 270^{\circ}$, then $\alpha_{2}+\alpha_{3}+\alpha_{4} \leqslant 270^{\circ}$, therefore $\alpha_{2} \leqslant 90^{\circ}$, a fortiori $\alpha_{1} \leqslant 90^{\circ}$ and thus $\alpha_{5} \geqslant 180^{\circ}$, a contradiction). Then we have $\sin ^{2} 108^{\circ}+\sin ^{2}\left(\alpha_{1}+\alpha_{5}-108^{\circ}\right)-\sin ^{2} \alpha_{1}-\sin ^{2} \alpha_{5}=2 \cos \left(\alpha_{1}+\alpha_{5}\right) \sin \left(\alpha_{1}-108^{\circ}\right) \sin \left(\alpha_{5}-108^{\circ}\right)>0$. It means that changing the angles $\alpha_{1}$ by $108^{\circ}$ and $\alpha_{5}$ by $\alpha_{1}+\alpha_{5}-108^{\circ}$ increases the sum of squares of the sines. Iterating this operation, we shall make all the angles equal to $108^{\circ}$, thus proving the inequality.