Finding the Fourth Proportional to 82.16, 113.43 and 62.72

Step by Step Solution

1. Step 1: Write the proportion equation
   82.16 : 113.43 = 62.72 : x
2. Step 2: Convert to fraction form
   82.16/113.43 = 62.72/x
3. Step 3: Cross multiply
   82.16x = 113.43 × 62.72
4. Step 4: Simplify right side
   82.16x = 7,114.02
5. Step 5: Solve for x
   x = 7,114.02/82.16
6. Step 6: Final answer
   x = 86.59