Finding the Fourth Proportional to 71,915.13, 99,243.33 and 40,086.04

Step by Step Solution

1. Step 1: Write the proportion equation
   71,915.13 : 99,243.33 = 40,086.04 : x
2. Step 2: Convert to fraction form
   71,915.13/99,243.33 = 40,086.04/x
3. Step 3: Cross multiply
   71,915.13x = 99,243.33 × 40,086.04
4. Step 4: Simplify right side
   71,915.13x = 3,978,272,096.11
5. Step 5: Solve for x
   x = 3,978,272,096.11/71,915.13
6. Step 6: Final answer
   x = 55,318.99