Finding the Fourth Proportional to 72,399.47, 99,911.18 and 40,568.59

Step by Step Solution

1. Step 1: Write the proportion equation
   72,399.47 : 99,911.18 = 40,568.59 : x
2. Step 2: Convert to fraction form
   72,399.47/99,911.18 = 40,568.59/x
3. Step 3: Cross multiply
   72,399.47x = 99,911.18 × 40,568.59
4. Step 4: Simplify right side
   72,399.47x = 4,053,254,995.44
5. Step 5: Solve for x
   x = 4,053,254,995.44/72,399.47
6. Step 6: Final answer
   x = 55,984.59