Finding the Fourth Proportional to 2,143.99, 3,216.22 and 682.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,143.99 : 3,216.22 = 682.80 : x
2. Step 2: Convert to fraction form
   2,143.99/3,216.22 = 682.80/x
3. Step 3: Cross multiply
   2,143.99x = 3,216.22 × 682.80
4. Step 4: Simplify right side
   2,143.99x = 2,196,033.31
5. Step 5: Solve for x
   x = 2,196,033.31/2,143.99
6. Step 6: Final answer
   x = 1,024.28