Finding the Fourth Proportional to 156,812.78, 216,401.27 and 85,192.17

Step by Step Solution

1. Step 1: Write the proportion equation
   156,812.78 : 216,401.27 = 85,192.17 : x
2. Step 2: Convert to fraction form
   156,812.78/216,401.27 = 85,192.17/x
3. Step 3: Cross multiply
   156,812.78x = 216,401.27 × 85,192.17
4. Step 4: Simplify right side
   156,812.78x = 18,435,693,356.10
5. Step 5: Solve for x
   x = 18,435,693,356.10/156,812.78
6. Step 6: Final answer
   x = 117,565.00