Suppose we have a convex quadrilateral $A B C D$ with diagonals $A C$ and $B D$ intersecting at $E$. To prove the lower bound, note that by the triangle inequality, $A B+B C>A C$ and $A D+D C>A C$, so $S=A B+B C+A D+D C>2 A C$. Similarly, $S>2 B D$, so $2 S>2 A C+2 B D=2 D$ gives $S>D$. To prove the upper bound, note that again by the triangle inequality, $A E+E B>A B, C E+B E>B C, A E+E D>A D, C E+E D>C D$. Adding these yields $2(A E+E C+B E+E D)>A B+B C+A D+C D=S$. Now since $A B C D$ is convex, $E$ is inside the quadrilateral, so $A E+E C=A C$ and $B E+E D=B D$. Thus $2(A C+B D)=D>S$. To achieve every real value in this range, first consider a square $A B C D$. This has $\frac{S}{D}=\sqrt{2}$. Suppose now that we have a rectangle with $A B=C D=1$ and $B C=A D=x$, where $0<x \leq 1$. As $x$ approaches 0, $\frac{S}{D}$ gets arbitrarily close to 1, so by intermediate value theorem, we hit every value $\frac{S}{D} \in(1, \sqrt{2}]$. To achieve the other values, we let $A B=B C=C D=D A=1$ and let $\theta=m \angle A B E$ vary from $45^{\circ}$ down to $0^{\circ}$ (i.e. a rhombus that gets thinner). This means $A C=2 \sin \theta$ and $B D=2 \cos \theta$. We have $S=4$ and $D=2(\sin \theta+\cos \theta)$. When $\theta=45^{\circ}, \frac{S}{D}=\sqrt{2}$, and when $\theta=0^{\circ}, \frac{S}{D}=2$. Thus by the intermediate value theorem, we are able to choose $\theta$ to obtain any value in the range $[\sqrt{2}, 2)$. Putting this construction together with the strict upper and lower bounds, we find that all possible values of $\frac{S}{D}$ are all real values in the open interval $(1,2)$.