Finding the Fourth Proportional to 71,687.52, 98,931.30 and 39,424.59

Step by Step Solution

1. Step 1: Write the proportion equation
   71,687.52 : 98,931.30 = 39,424.59 : x
2. Step 2: Convert to fraction form
   71,687.52/98,931.30 = 39,424.59/x
3. Step 3: Cross multiply
   71,687.52x = 98,931.30 × 39,424.59
4. Step 4: Simplify right side
   71,687.52x = 3,900,325,940.67
5. Step 5: Solve for x
   x = 3,900,325,940.67/71,687.52
6. Step 6: Final answer
   x = 54,407.32