Finding the Fourth Proportional to 71,139.78, 98,171.73 and 39,310.02

Step by Step Solution

1. Step 1: Write the proportion equation
   71,139.78 : 98,171.73 = 39,310.02 : x
2. Step 2: Convert to fraction form
   71,139.78/98,171.73 = 39,310.02/x
3. Step 3: Cross multiply
   71,139.78x = 98,171.73 × 39,310.02
4. Step 4: Simplify right side
   71,139.78x = 3,859,132,669.73
5. Step 5: Solve for x
   x = 3,859,132,669.73/71,139.78
6. Step 6: Final answer
   x = 54,247.18