Finding the Fourth Proportional to 92.91, 128.17 and 60.15

Step by Step Solution

1. Step 1: Write the proportion equation
   92.91 : 128.17 = 60.15 : x
2. Step 2: Convert to fraction form
   92.91/128.17 = 60.15/x
3. Step 3: Cross multiply
   92.91x = 128.17 × 60.15
4. Step 4: Simplify right side
   92.91x = 7,709.43
5. Step 5: Solve for x
   x = 7,709.43/92.91
6. Step 6: Final answer
   x = 82.98