Finding the Fourth Proportional to 72,107.98, 99,508.42 and 39,842.50

Step by Step Solution

1. Step 1: Write the proportion equation
   72,107.98 : 99,508.42 = 39,842.50 : x
2. Step 2: Convert to fraction form
   72,107.98/99,508.42 = 39,842.50/x
3. Step 3: Cross multiply
   72,107.98x = 99,508.42 × 39,842.50
4. Step 4: Simplify right side
   72,107.98x = 3,964,664,223.85
5. Step 5: Solve for x
   x = 3,964,664,223.85/72,107.98
6. Step 6: Final answer
   x = 54,982.32