Finding the Fourth Proportional to 71,238.69, 98,308.99 and 39,406.91

Step by Step Solution

1. Step 1: Write the proportion equation
   71,238.69 : 98,308.99 = 39,406.91 : x
2. Step 2: Convert to fraction form
   71,238.69/98,308.99 = 39,406.91/x
3. Step 3: Cross multiply
   71,238.69x = 98,308.99 × 39,406.91
4. Step 4: Simplify right side
   71,238.69x = 3,874,053,078.83
5. Step 5: Solve for x
   x = 3,874,053,078.83/71,238.69
6. Step 6: Final answer
   x = 54,381.31