Finding the Fourth Proportional to 71,472.48, 98,636.04 and 39,642.72

Step by Step Solution

1. Step 1: Write the proportion equation
   71,472.48 : 98,636.04 = 39,642.72 : x
2. Step 2: Convert to fraction form
   71,472.48/98,636.04 = 39,642.72/x
3. Step 3: Cross multiply
   71,472.48x = 98,636.04 × 39,642.72
4. Step 4: Simplify right side
   71,472.48x = 3,910,200,915.63
5. Step 5: Solve for x
   x = 3,910,200,915.63/71,472.48
6. Step 6: Final answer
   x = 54,709.18