Finding the Fourth Proportional to 71,721.57, 98,974.28 and 39,454.83

Step by Step Solution

1. Step 1: Write the proportion equation
   71,721.57 : 98,974.28 = 39,454.83 : x
2. Step 2: Convert to fraction form
   71,721.57/98,974.28 = 39,454.83/x
3. Step 3: Cross multiply
   71,721.57x = 98,974.28 × 39,454.83
4. Step 4: Simplify right side
   71,721.57x = 3,905,013,194.50
5. Step 5: Solve for x
   x = 3,905,013,194.50/71,721.57
6. Step 6: Final answer
   x = 54,446.84