Finding the Fourth Proportional to 71,963.28, 99,305.46 and 40,131.42

Step by Step Solution

1. Step 1: Write the proportion equation
   71,963.28 : 99,305.46 = 40,131.42 : x
2. Step 2: Convert to fraction form
   71,963.28/99,305.46 = 40,131.42/x
3. Step 3: Cross multiply
   71,963.28x = 99,305.46 × 40,131.42
4. Step 4: Simplify right side
   71,963.28x = 3,985,269,123.55
5. Step 5: Solve for x
   x = 3,985,269,123.55/71,963.28
6. Step 6: Final answer
   x = 55,379.20