Finding the Fourth Proportional to 71,661.16, 98,890.50 and 39,831.40

Step by Step Solution

1. Step 1: Write the proportion equation
   71,661.16 : 98,890.50 = 39,831.40 : x
2. Step 2: Convert to fraction form
   71,661.16/98,890.50 = 39,831.40/x
3. Step 3: Cross multiply
   71,661.16x = 98,890.50 × 39,831.40
4. Step 4: Simplify right side
   71,661.16x = 3,938,947,061.70
5. Step 5: Solve for x
   x = 3,938,947,061.70/71,661.16
6. Step 6: Final answer
   x = 54,966.28