Finding the Fourth Proportional to 2,810.68, 4,216.58 and 862.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,810.68 : 4,216.58 = 862.72 : x
2. Step 2: Convert to fraction form
   2,810.68/4,216.58 = 862.72/x
3. Step 3: Cross multiply
   2,810.68x = 4,216.58 × 862.72
4. Step 4: Simplify right side
   2,810.68x = 3,637,727.90
5. Step 5: Solve for x
   x = 3,637,727.90/2,810.68
6. Step 6: Final answer
   x = 1,294.25