The area of any rectangle is the product of its length and its width - [tex]A=lw[/tex]. We've been given the area and the length, and we can use those values to solve for the width:
[tex]95.4=10.6w\\ \frac{95.4}{10.6}=w\\\\ 9=w [/tex]
So, the length of the missing side is 9 ft.