Finding the Fourth Proportional to 2,809.98, 4,215.78 and 862.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,809.98 : 4,215.78 = 862.47 : x
2. Step 2: Convert to fraction form
   2,809.98/4,215.78 = 862.47/x
3. Step 3: Cross multiply
   2,809.98x = 4,215.78 × 862.47
4. Step 4: Simplify right side
   2,809.98x = 3,635,983.78
5. Step 5: Solve for x
   x = 3,635,983.78/2,809.98
6. Step 6: Final answer
   x = 1,293.95