Finding the Fourth Proportional to 71,498.64, 98,663.40 and 39,666.48

Step by Step Solution

1. Step 1: Write the proportion equation
   71,498.64 : 98,663.40 = 39,666.48 : x
2. Step 2: Convert to fraction form
   71,498.64/98,663.40 = 39,666.48/x
3. Step 3: Cross multiply
   71,498.64x = 98,663.40 × 39,666.48
4. Step 4: Simplify right side
   71,498.64x = 3,913,629,782.83
5. Step 5: Solve for x
   x = 3,913,629,782.83/71,498.64
6. Step 6: Final answer
   x = 54,737.12