Finding the Fourth Proportional to 2,810.57, 4,215.83 and 862.73

Step by Step Solution

1. Step 1: Write the proportion equation
   2,810.57 : 4,215.83 = 862.73 : x
2. Step 2: Convert to fraction form
   2,810.57/4,215.83 = 862.73/x
3. Step 3: Cross multiply
   2,810.57x = 4,215.83 × 862.73
4. Step 4: Simplify right side
   2,810.57x = 3,637,097.62
5. Step 5: Solve for x
   x = 3,637,097.62/2,810.57
6. Step 6: Final answer
   x = 1,294.08