Finding the Fourth Proportional to 71,949.82, 99,288.30 and 39,685.72

Step by Step Solution

1. Step 1: Write the proportion equation
   71,949.82 : 99,288.30 = 39,685.72 : x
2. Step 2: Convert to fraction form
   71,949.82/99,288.30 = 39,685.72/x
3. Step 3: Cross multiply
   71,949.82x = 99,288.30 × 39,685.72
4. Step 4: Simplify right side
   71,949.82x = 3,940,327,930.85
5. Step 5: Solve for x
   x = 3,940,327,930.85/71,949.82
6. Step 6: Final answer
   x = 54,764.94