Finding the Fourth Proportional to 71,951.83, 99,292.30 and 39,689.57

Step by Step Solution

1. Step 1: Write the proportion equation
   71,951.83 : 99,292.30 = 39,689.57 : x
2. Step 2: Convert to fraction form
   71,951.83/99,292.30 = 39,689.57/x
3. Step 3: Cross multiply
   71,951.83x = 99,292.30 × 39,689.57
4. Step 4: Simplify right side
   71,951.83x = 3,940,868,840.32
5. Step 5: Solve for x
   x = 3,940,868,840.32/71,951.83
6. Step 6: Final answer
   x = 54,770.93