Finding the Fourth Proportional to 72,224.31, 99,669.79 and 40,391.16

Step by Step Solution

1. Step 1: Write the proportion equation
   72,224.31 : 99,669.79 = 40,391.16 : x
2. Step 2: Convert to fraction form
   72,224.31/99,669.79 = 40,391.16/x
3. Step 3: Cross multiply
   72,224.31x = 99,669.79 × 40,391.16
4. Step 4: Simplify right side
   72,224.31x = 4,025,778,111.78
5. Step 5: Solve for x
   x = 4,025,778,111.78/72,224.31
6. Step 6: Final answer
   x = 55,739.93