Finding the Fourth Proportional to 3,947.70, 5,449.79 and 2,456.09

Step by Step Solution

1. Step 1: Write the proportion equation
   3,947.70 : 5,449.79 = 2,456.09 : x
2. Step 2: Convert to fraction form
   3,947.70/5,449.79 = 2,456.09/x
3. Step 3: Cross multiply
   3,947.70x = 5,449.79 × 2,456.09
4. Step 4: Simplify right side
   3,947.70x = 13,385,162.44
5. Step 5: Solve for x
   x = 13,385,162.44/3,947.70
6. Step 6: Final answer
   x = 3,390.63