Finding the Fourth Proportional to 72,040.48, 99,417.36 and 40,210.72

Step by Step Solution

1. Step 1: Write the proportion equation
   72,040.48 : 99,417.36 = 40,210.72 : x
2. Step 2: Convert to fraction form
   72,040.48/99,417.36 = 40,210.72/x
3. Step 3: Cross multiply
   72,040.48x = 99,417.36 × 40,210.72
4. Step 4: Simplify right side
   72,040.48x = 3,997,643,626.10
5. Step 5: Solve for x
   x = 3,997,643,626.10/72,040.48
6. Step 6: Final answer
   x = 55,491.63