Finding the Fourth Proportional to 1,422.48, 2,131.56 and 681.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422.48 : 2,131.56 = 681.24 : x
2. Step 2: Convert to fraction form
   1,422.48/2,131.56 = 681.24/x
3. Step 3: Cross multiply
   1,422.48x = 2,131.56 × 681.24
4. Step 4: Simplify right side
   1,422.48x = 1,452,103.93
5. Step 5: Solve for x
   x = 1,452,103.93/1,422.48
6. Step 6: Final answer
   x = 1,020.83