Finding the Fourth Proportional to 72,142.56, 99,554.88 and 40,311.72

Step by Step Solution

1. Step 1: Write the proportion equation
   72,142.56 : 99,554.88 = 40,311.72 : x
2. Step 2: Convert to fraction form
   72,142.56/99,554.88 = 40,311.72/x
3. Step 3: Cross multiply
   72,142.56x = 99,554.88 × 40,311.72
4. Step 4: Simplify right side
   72,142.56x = 4,013,228,447.19
5. Step 5: Solve for x
   x = 4,013,228,447.19/72,142.56
6. Step 6: Final answer
   x = 55,629.14