In the figure below, $\overline{AF}$, $\overline{BE}$, and $\overline{CD}$ are parallel. Points $B$ and $E$ lie on $\overline{AC}$ and $\overline{FD}$, respectively. If $AB=9$, $BC=18.5$ , and $FE=8.5$ , what is the length of $\overline{ED}$, to the nearest tenth?
