Finding the Fourth Proportional to 72,047.48, 99,423.45 and 40,215.69

Step by Step Solution

1. Step 1: Write the proportion equation
   72,047.48 : 99,423.45 = 40,215.69 : x
2. Step 2: Convert to fraction form
   72,047.48/99,423.45 = 40,215.69/x
3. Step 3: Cross multiply
   72,047.48x = 99,423.45 × 40,215.69
4. Step 4: Simplify right side
   72,047.48x = 3,998,382,643.93
5. Step 5: Solve for x
   x = 3,998,382,643.93/72,047.48
6. Step 6: Final answer
   x = 55,496.50