Finding the Fourth Proportional to 2,863.89, 3,949.92 and 1,919.36

Step by Step Solution

1. Step 1: Write the proportion equation
   2,863.89 : 3,949.92 = 1,919.36 : x
2. Step 2: Convert to fraction form
   2,863.89/3,949.92 = 1,919.36/x
3. Step 3: Cross multiply
   2,863.89x = 3,949.92 × 1,919.36
4. Step 4: Simplify right side
   2,863.89x = 7,581,328.33
5. Step 5: Solve for x
   x = 7,581,328.33/2,863.89
6. Step 6: Final answer
   x = 2,647.21