Finding the Fourth Proportional to 1,643.98, 2,463.69 and 862.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,643.98 : 2,463.69 = 862.43 : x
2. Step 2: Convert to fraction form
   1,643.98/2,463.69 = 862.43/x
3. Step 3: Cross multiply
   1,643.98x = 2,463.69 × 862.43
4. Step 4: Simplify right side
   1,643.98x = 2,124,766.33
5. Step 5: Solve for x
   x = 2,124,766.33/1,643.98
6. Step 6: Final answer
   x = 1,292.45