Finding the Fourth Proportional to 71,499.98, 98,681.78 and 39,679.13

Step by Step Solution

1. Step 1: Write the proportion equation
   71,499.98 : 98,681.78 = 39,679.13 : x
2. Step 2: Convert to fraction form
   71,499.98/98,681.78 = 39,679.13/x
3. Step 3: Cross multiply
   71,499.98x = 98,681.78 × 39,679.13
4. Step 4: Simplify right side
   71,499.98x = 3,915,607,177.25
5. Step 5: Solve for x
   x = 3,915,607,177.25/71,499.98
6. Step 6: Final answer
   x = 54,763.75