Answer
1000
Work Step by Step
4$\frac{1}{2}$ % $\times$ x =45
4.5 % $\times$ x =45
0.045 $\times$ x =45
$\frac{0.045\times x}{0.045}$ = $\frac{45}{0.045}$
x=$\frac{45}{0.045}$ $\times$ $\frac{1000}{1000}$
x=$\frac{45000}{45}$
x= 1000