Finding the Fourth Proportional to 71,812.40, 99,098.52 and 39,980.48

Step by Step Solution

1. Step 1: Write the proportion equation
   71,812.40 : 99,098.52 = 39,980.48 : x
2. Step 2: Convert to fraction form
   71,812.40/99,098.52 = 39,980.48/x
3. Step 3: Cross multiply
   71,812.40x = 99,098.52 × 39,980.48
4. Step 4: Simplify right side
   71,812.40x = 3,962,006,396.89
5. Step 5: Solve for x
   x = 3,962,006,396.89/71,812.40
6. Step 6: Final answer
   x = 55,171.62