Finding the Fourth Proportional to 71,715.86, 98,960.31 and 39,879.62

Step by Step Solution

1. Step 1: Write the proportion equation
   71,715.86 : 98,960.31 = 39,879.62 : x
2. Step 2: Convert to fraction form
   71,715.86/98,960.31 = 39,879.62/x
3. Step 3: Cross multiply
   71,715.86x = 98,960.31 × 39,879.62
4. Step 4: Simplify right side
   71,715.86x = 3,946,499,557.88
5. Step 5: Solve for x
   x = 3,946,499,557.88/71,715.86
6. Step 6: Final answer
   x = 55,029.66