Finding the Fourth Proportional to 71,499.91, 98,668.56 and 39,668.13

Step by Step Solution

1. Step 1: Write the proportion equation
   71,499.91 : 98,668.56 = 39,668.13 : x
2. Step 2: Convert to fraction form
   71,499.91/98,668.56 = 39,668.13/x
3. Step 3: Cross multiply
   71,499.91x = 98,668.56 × 39,668.13
4. Step 4: Simplify right side
   71,499.91x = 3,913,996,771.65
5. Step 5: Solve for x
   x = 3,913,996,771.65/71,499.91
6. Step 6: Final answer
   x = 54,741.28