Finding the Fourth Proportional to 71,815.72, 99,100.92 and 39,983.80

Step by Step Solution

1. Step 1: Write the proportion equation
   71,815.72 : 99,100.92 = 39,983.80 : x
2. Step 2: Convert to fraction form
   71,815.72/99,100.92 = 39,983.80/x
3. Step 3: Cross multiply
   71,815.72x = 99,100.92 × 39,983.80
4. Step 4: Simplify right side
   71,815.72x = 3,962,431,365.10
5. Step 5: Solve for x
   x = 3,962,431,365.10/71,815.72
6. Step 6: Final answer
   x = 55,174.99