Answer
$x\approx50.4$
Work Step by Step
We are given the proportion $\frac{.7}{9.8}=\frac{3.6}{x}$. We can set the cross products equal to each other and solve for the unknown variable.
$.7\times x=9.8\times3.6$
$.7x=35.28$
Divide both sides by .7.
$x\approx50.4$