#### Answer

$x=50.4$

#### Work Step by Step

We can set the cross products of the given proportion equal to each other and then solve for the unknown variable.
$x\times.7=3.6\times9.8$
$.7x=35.28$
Divide both sides by .7.
$\frac{.7x}{.7}=\frac{35.28}{.7}$
$x=50.4$