Finding the Fourth Proportional to 72,145.83, 99,561.50 and 40,315.26

Step by Step Solution

1. Step 1: Write the proportion equation
   72,145.83 : 99,561.50 = 40,315.26 : x
2. Step 2: Convert to fraction form
   72,145.83/99,561.50 = 40,315.26/x
3. Step 3: Cross multiply
   72,145.83x = 99,561.50 × 40,315.26
4. Step 4: Simplify right side
   72,145.83x = 4,013,847,758.49
5. Step 5: Solve for x
   x = 4,013,847,758.49/72,145.83
6. Step 6: Final answer
   x = 55,635.20