Finding the Fourth Proportional to 2,449.49, 3,379.49 and 1,387.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,449.49 : 3,379.49 = 1,387.15 : x
2. Step 2: Convert to fraction form
   2,449.49/3,379.49 = 1,387.15/x
3. Step 3: Cross multiply
   2,449.49x = 3,379.49 × 1,387.15
4. Step 4: Simplify right side
   2,449.49x = 4,687,854.57
5. Step 5: Solve for x
   x = 4,687,854.57/2,449.49
6. Step 6: Final answer
   x = 1,913.81