Finding the Fourth Proportional to 2,809.92, 4,215.69 and 862.41

Step by Step Solution

1. Step 1: Write the proportion equation
   2,809.92 : 4,215.69 = 862.41 : x
2. Step 2: Convert to fraction form
   2,809.92/4,215.69 = 862.41/x
3. Step 3: Cross multiply
   2,809.92x = 4,215.69 × 862.41
4. Step 4: Simplify right side
   2,809.92x = 3,635,648.90
5. Step 5: Solve for x
   x = 3,635,648.90/2,809.92
6. Step 6: Final answer
   x = 1,293.86