Finding the Fourth Proportional to 72,145.69, 99,559.19 and 40,314.85

Step by Step Solution

1. Step 1: Write the proportion equation
   72,145.69 : 99,559.19 = 40,314.85 : x
2. Step 2: Convert to fraction form
   72,145.69/99,559.19 = 40,314.85/x
3. Step 3: Cross multiply
   72,145.69x = 99,559.19 × 40,314.85
4. Step 4: Simplify right side
   72,145.69x = 4,013,713,662.86
5. Step 5: Solve for x
   x = 4,013,713,662.86/72,145.69
6. Step 6: Final answer
   x = 55,633.45