Finding the Fourth Proportional to 71,861.72, 99,172.24 and 40,030.64

Step by Step Solution

1. Step 1: Write the proportion equation
   71,861.72 : 99,172.24 = 40,030.64 : x
2. Step 2: Convert to fraction form
   71,861.72/99,172.24 = 40,030.64/x
3. Step 3: Cross multiply
   71,861.72x = 99,172.24 × 40,030.64
4. Step 4: Simplify right side
   71,861.72x = 3,969,928,237.43
5. Step 5: Solve for x
   x = 3,969,928,237.43/71,861.72
6. Step 6: Final answer
   x = 55,243.99