Finding the Fourth Proportional to 72,146.69, 99,560.57 and 40,315.85

Step by Step Solution

1. Step 1: Write the proportion equation
   72,146.69 : 99,560.57 = 40,315.85 : x
2. Step 2: Convert to fraction form
   72,146.69/99,560.57 = 40,315.85/x
3. Step 3: Cross multiply
   72,146.69x = 99,560.57 × 40,315.85
4. Step 4: Simplify right side
   72,146.69x = 4,013,869,006.03
5. Step 5: Solve for x
   x = 4,013,869,006.03/72,146.69
6. Step 6: Final answer
   x = 55,634.83