Finding the Fourth Proportional to 71,915.38, 99,243.68 and 40,086.30

Step by Step Solution

1. Step 1: Write the proportion equation
   71,915.38 : 99,243.68 = 40,086.30 : x
2. Step 2: Convert to fraction form
   71,915.38/99,243.68 = 40,086.30/x
3. Step 3: Cross multiply
   71,915.38x = 99,243.68 × 40,086.30
4. Step 4: Simplify right side
   71,915.38x = 3,978,311,929.58
5. Step 5: Solve for x
   x = 3,978,311,929.58/71,915.38
6. Step 6: Final answer
   x = 55,319.35