Finding the Fourth Proportional to 72,418.26, 99,937.17 and 40,152.78

Step by Step Solution

1. Step 1: Write the proportion equation
   72,418.26 : 99,937.17 = 40,152.78 : x
2. Step 2: Convert to fraction form
   72,418.26/99,937.17 = 40,152.78/x
3. Step 3: Cross multiply
   72,418.26x = 99,937.17 × 40,152.78
4. Step 4: Simplify right side
   72,418.26x = 4,012,755,200.83
5. Step 5: Solve for x
   x = 4,012,755,200.83/72,418.26
6. Step 6: Final answer
   x = 55,410.82