Finding the Fourth Proportional to 72,146.24, 99,559.90 and 40,315.40

Step by Step Solution

1. Step 1: Write the proportion equation
   72,146.24 : 99,559.90 = 40,315.40 : x
2. Step 2: Convert to fraction form
   72,146.24/99,559.90 = 40,315.40/x
3. Step 3: Cross multiply
   72,146.24x = 99,559.90 × 40,315.40
4. Step 4: Simplify right side
   72,146.24x = 4,013,797,192.46
5. Step 5: Solve for x
   x = 4,013,797,192.46/72,146.24
6. Step 6: Final answer
   x = 55,634.18