Finding the Fourth Proportional to 83,171.30, 124,562.55 and 81,500.90

Step by Step Solution

1. Step 1: Write the proportion equation
   83,171.30 : 124,562.55 = 81,500.90 : x
2. Step 2: Convert to fraction form
   83,171.30/124,562.55 = 81,500.90/x
3. Step 3: Cross multiply
   83,171.30x = 124,562.55 × 81,500.90
4. Step 4: Simplify right side
   83,171.30x = 10,151,959,931.30
5. Step 5: Solve for x
   x = 10,151,959,931.30/83,171.30
6. Step 6: Final answer
   x = 122,060.85