Finding the Fourth Proportional to 72,423.55, 99,942.71 and 40,158.30

Step by Step Solution

1. Step 1: Write the proportion equation
   72,423.55 : 99,942.71 = 40,158.30 : x
2. Step 2: Convert to fraction form
   72,423.55/99,942.71 = 40,158.30/x
3. Step 3: Cross multiply
   72,423.55x = 99,942.71 × 40,158.30
4. Step 4: Simplify right side
   72,423.55x = 4,013,529,168.70
5. Step 5: Solve for x
   x = 4,013,529,168.70/72,423.55
6. Step 6: Final answer
   x = 55,417.46