Finding the Fourth Proportional to 71,792.64, 99,071.52 and 39,960.48

Step by Step Solution

1. Step 1: Write the proportion equation
   71,792.64 : 99,071.52 = 39,960.48 : x
2. Step 2: Convert to fraction form
   71,792.64/99,071.52 = 39,960.48/x
3. Step 3: Cross multiply
   71,792.64x = 99,071.52 × 39,960.48
4. Step 4: Simplify right side
   71,792.64x = 3,958,945,493.53
5. Step 5: Solve for x
   x = 3,958,945,493.53/71,792.64
6. Step 6: Final answer
   x = 55,144.17