Finding the Fourth Proportional to 71,787.89, 99,040.71 and 71,677.17

Step by Step Solution

1. Step 1: Write the proportion equation
   71,787.89 : 99,040.71 = 71,677.17 : x
2. Step 2: Convert to fraction form
   71,787.89/99,040.71 = 71,677.17/x
3. Step 3: Cross multiply
   71,787.89x = 99,040.71 × 71,677.17
4. Step 4: Simplify right side
   71,787.89x = 7,098,957,807.59
5. Step 5: Solve for x
   x = 7,098,957,807.59/71,787.89
6. Step 6: Final answer
   x = 98,887.96