Finding the Fourth Proportional to 71,697.98, 98,942.59 and 39,866.60

Step by Step Solution

1. Step 1: Write the proportion equation
   71,697.98 : 98,942.59 = 39,866.60 : x
2. Step 2: Convert to fraction form
   71,697.98/98,942.59 = 39,866.60/x
3. Step 3: Cross multiply
   71,697.98x = 98,942.59 × 39,866.60
4. Step 4: Simplify right side
   71,697.98x = 3,944,504,658.49
5. Step 5: Solve for x
   x = 3,944,504,658.49/71,697.98
6. Step 6: Final answer
   x = 55,015.56