Finding the Fourth Proportional to 129,360.71, 178,517.52 and 72,772.09

Step by Step Solution

1. Step 1: Write the proportion equation
   129,360.71 : 178,517.52 = 72,772.09 : x
2. Step 2: Convert to fraction form
   129,360.71/178,517.52 = 72,772.09/x
3. Step 3: Cross multiply
   129,360.71x = 178,517.52 × 72,772.09
4. Step 4: Simplify right side
   129,360.71x = 12,991,092,585.72
5. Step 5: Solve for x
   x = 12,991,092,585.72/129,360.71
6. Step 6: Final answer
   x = 100,425.33