Question content area top Part 1 Use proportional reasoning to find the missing side length of the similar triangles. LOADING... Click the icon to view the similar triangles. Question content area bottom Part 1 Complete the proportional reasoning. StartFraction AC Over PR EndFraction equals StartFraction PS Over SR EndFraction StartFraction PS Over SR EndFraction StartFraction DC Over SR EndFraction StartFraction AD Over SR EndFraction ▼  StartFraction x Over 12 EndFraction StartFraction x Over 18 EndFraction StartFraction x Over 13.5 EndFraction equals ▼  StartFraction 12 Over 18 EndFraction StartFraction 12 Over 12 EndFraction StartFraction 12 Over 13.5 EndFraction x equals enter your response here AC is enter your response here in. ​(Type integers or​ decimals.)