Finding the Fourth Proportional to 2,810.91, 4,216.98 and 863.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,810.91 : 4,216.98 = 863.06 : x
2. Step 2: Convert to fraction form
   2,810.91/4,216.98 = 863.06/x
3. Step 3: Cross multiply
   2,810.91x = 4,216.98 × 863.06
4. Step 4: Simplify right side
   2,810.91x = 3,639,520.54
5. Step 5: Solve for x
   x = 3,639,520.54/2,810.91
6. Step 6: Final answer
   x = 1,294.78