Finding the Fourth Proportional to 156,900.30, 216,522.69 and 85,280.13

Step by Step Solution

1. Step 1: Write the proportion equation
   156,900.30 : 216,522.69 = 85,280.13 : x
2. Step 2: Convert to fraction form
   156,900.30/216,522.69 = 85,280.13/x
3. Step 3: Cross multiply
   156,900.30x = 216,522.69 × 85,280.13
4. Step 4: Simplify right side
   156,900.30x = 18,465,083,151.15
5. Step 5: Solve for x
   x = 18,465,083,151.15/156,900.30
6. Step 6: Final answer
   x = 117,686.73