Finding the Fourth Proportional to 71,915.37, 99,243.67 and 40,086.28

Step by Step Solution

1. Step 1: Write the proportion equation
   71,915.37 : 99,243.67 = 40,086.28 : x
2. Step 2: Convert to fraction form
   71,915.37/99,243.67 = 40,086.28/x
3. Step 3: Cross multiply
   71,915.37x = 99,243.67 × 40,086.28
4. Step 4: Simplify right side
   71,915.37x = 3,978,309,543.85
5. Step 5: Solve for x
   x = 3,978,309,543.85/71,915.37
6. Step 6: Final answer
   x = 55,319.32