Finding the Fourth Proportional to 71,792.48, 99,061.80 and 39,960.56

Step by Step Solution

1. Step 1: Write the proportion equation
   71,792.48 : 99,061.80 = 39,960.56 : x
2. Step 2: Convert to fraction form
   71,792.48/99,061.80 = 39,960.56/x
3. Step 3: Cross multiply
   71,792.48x = 99,061.80 × 39,960.56
4. Step 4: Simplify right side
   71,792.48x = 3,958,565,002.61
5. Step 5: Solve for x
   x = 3,958,565,002.61/71,792.48
6. Step 6: Final answer
   x = 55,138.99