Finding the Fourth Proportional to 71,443.60, 98,592.20 and 39,612.88

Step by Step Solution

1. Step 1: Write the proportion equation
   71,443.60 : 98,592.20 = 39,612.88 : x
2. Step 2: Convert to fraction form
   71,443.60/98,592.20 = 39,612.88/x
3. Step 3: Cross multiply
   71,443.60x = 98,592.20 × 39,612.88
4. Step 4: Simplify right side
   71,443.60x = 3,905,520,987.54
5. Step 5: Solve for x
   x = 3,905,520,987.54/71,443.60
6. Step 6: Final answer
   x = 54,665.79