Finding the Fourth Proportional to 71,796.72, 99,083.76 and 39,964.80

Step by Step Solution

1. Step 1: Write the proportion equation
   71,796.72 : 99,083.76 = 39,964.80 : x
2. Step 2: Convert to fraction form
   71,796.72/99,083.76 = 39,964.80/x
3. Step 3: Cross multiply
   71,796.72x = 99,083.76 × 39,964.80
4. Step 4: Simplify right side
   71,796.72x = 3,959,862,651.65
5. Step 5: Solve for x
   x = 3,959,862,651.65/71,796.72
6. Step 6: Final answer
   x = 55,153.81