Finding the Fourth Proportional to 71,831.32, 99,128.82 and 40,003.18

Step by Step Solution

1. Step 1: Write the proportion equation
   71,831.32 : 99,128.82 = 40,003.18 : x
2. Step 2: Convert to fraction form
   71,831.32/99,128.82 = 40,003.18/x
3. Step 3: Cross multiply
   71,831.32x = 99,128.82 × 40,003.18
4. Step 4: Simplify right side
   71,831.32x = 3,965,468,029.65
5. Step 5: Solve for x
   x = 3,965,468,029.65/71,831.32
6. Step 6: Final answer
   x = 55,205.28