Finding the Fourth Proportional to 72,018.66, 99,385.61 and 40,185.66

Step by Step Solution

1. Step 1: Write the proportion equation
   72,018.66 : 99,385.61 = 40,185.66 : x
2. Step 2: Convert to fraction form
   72,018.66/99,385.61 = 40,185.66/x
3. Step 3: Cross multiply
   72,018.66x = 99,385.61 × 40,185.66
4. Step 4: Simplify right side
   72,018.66x = 3,993,876,131.42
5. Step 5: Solve for x
   x = 3,993,876,131.42/72,018.66
6. Step 6: Final answer
   x = 55,456.13