Finding the Fourth Proportional to 2,594.56, 3,891.78 and 863.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,594.56 : 3,891.78 = 863.20 : x
2. Step 2: Convert to fraction form
   2,594.56/3,891.78 = 863.20/x
3. Step 3: Cross multiply
   2,594.56x = 3,891.78 × 863.20
4. Step 4: Simplify right side
   2,594.56x = 3,359,384.50
5. Step 5: Solve for x
   x = 3,359,384.50/2,594.56
6. Step 6: Final answer
   x = 1,294.78