Finding the Fourth Proportional to 271,498.20, 407,305.83 and 81,942.71

Step by Step Solution

1. Step 1: Write the proportion equation
   271,498.20 : 407,305.83 = 81,942.71 : x
2. Step 2: Convert to fraction form
   271,498.20/407,305.83 = 81,942.71/x
3. Step 3: Cross multiply
   271,498.20x = 407,305.83 × 81,942.71
4. Step 4: Simplify right side
   271,498.20x = 33,375,741,472.47
5. Step 5: Solve for x
   x = 33,375,741,472.47/271,498.20
6. Step 6: Final answer
   x = 122,931.72