Hello Terrion,
You can create two proportions based on the 4 sides:
You can reduce 72/96 to 36/48, then 18/24, then 9/12 and finally, 3/4
So we can rewrite the proportion as:
Cross-multiply and you get: 6*4 = 3*x so 24 = 3x
Divide by 3 on both sides and you get: 8 = x
Answer: x = 8