Finding the Fourth Proportional to 71,790.89, 99,044.85 and 71,680.17

Step by Step Solution

1. Step 1: Write the proportion equation
   71,790.89 : 99,044.85 = 71,680.17 : x
2. Step 2: Convert to fraction form
   71,790.89/99,044.85 = 71,680.17/x
3. Step 3: Cross multiply
   71,790.89x = 99,044.85 × 71,680.17
4. Step 4: Simplify right side
   71,790.89x = 7,099,551,685.62
5. Step 5: Solve for x
   x = 7,099,551,685.62/71,790.89
6. Step 6: Final answer
   x = 98,892.10