Finding the Fourth Proportional to 3,921.97, 5,410.82 and 2,505.71

Step by Step Solution

1. Step 1: Write the proportion equation
   3,921.97 : 5,410.82 = 2,505.71 : x
2. Step 2: Convert to fraction form
   3,921.97/5,410.82 = 2,505.71/x
3. Step 3: Cross multiply
   3,921.97x = 5,410.82 × 2,505.71
4. Step 4: Simplify right side
   3,921.97x = 13,557,945.78
5. Step 5: Solve for x
   x = 13,557,945.78/3,921.97
6. Step 6: Final answer
   x = 3,456.92