Finding the Fourth Proportional to 2,618.50, 3,926.91 and 863.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,618.50 : 3,926.91 = 863.18 : x
2. Step 2: Convert to fraction form
   2,618.50/3,926.91 = 863.18/x
3. Step 3: Cross multiply
   2,618.50x = 3,926.91 × 863.18
4. Step 4: Simplify right side
   2,618.50x = 3,389,613.57
5. Step 5: Solve for x
   x = 3,389,613.57/2,618.50
6. Step 6: Final answer
   x = 1,294.49