$\"\"$

The proportion is $\"\"$ .

$\"\"$ (Write the proportion)

$\"\"$ (Cross products property)

$\"\"$ (Apply distributive law) \ \

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

$\"\"$ (Subtract 180 from each side) \ \

$\"\"$ (Subtract: $\"\"$ )

$\"\"$ (Apply additive identity property: $\"\"$ )

$\"\"$ (Divide each side by 36)

$\"\"$ (Cancel common terms)

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

The solution is $\"\"$ .