Finding the Fourth Proportional to 71,791.98, 99,061.11 and 39,960.06

Step by Step Solution

1. Step 1: Write the proportion equation
   71,791.98 : 99,061.11 = 39,960.06 : x
2. Step 2: Convert to fraction form
   71,791.98/99,061.11 = 39,960.06/x
3. Step 3: Cross multiply
   71,791.98x = 99,061.11 × 39,960.06
4. Step 4: Simplify right side
   71,791.98x = 3,958,487,899.27
5. Step 5: Solve for x
   x = 3,958,487,899.27/71,791.98
6. Step 6: Final answer
   x = 55,138.30