$\"\"$

The two figures are similar.

The corresponding angles are congruent and same measure.

The corresponding sides are proportional and opposite corresponding angles.

So, $\"\"$ .

$\"\"$ (Proportion)

$\"\"$ (Substitute $\"\"$ ) $\"\"$

Apply cross product property: If $\"\"$ , where $\"\"$ .

$\"\"$

$\"\"$ (Multiply: $\"\"$ )

$\"\"$ (Divide each side by 12 and 9)

$\"\"$ (Cancel common terms)

$\"\"$ (Divide: $\"\"$ ) $\"\"$

The solution is $\"\"$ .