Finding the Fourth Proportional to 2,179.57, 3,267.12 and 862.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,179.57 : 3,267.12 = 862.80 : x
2. Step 2: Convert to fraction form
   2,179.57/3,267.12 = 862.80/x
3. Step 3: Cross multiply
   2,179.57x = 3,267.12 × 862.80
4. Step 4: Simplify right side
   2,179.57x = 2,818,854.80
5. Step 5: Solve for x
   x = 2,818,854.80/2,179.57
6. Step 6: Final answer
   x = 1,293.31