Finding the Fourth Proportional to 82.32, 113.32 and 72.56

Step by Step Solution

1. Step 1: Write the proportion equation
   82.32 : 113.32 = 72.56 : x
2. Step 2: Convert to fraction form
   82.32/113.32 = 72.56/x
3. Step 3: Cross multiply
   82.32x = 113.32 × 72.56
4. Step 4: Simplify right side
   82.32x = 8,222.50
5. Step 5: Solve for x
   x = 8,222.50/82.32
6. Step 6: Final answer
   x = 99.88