Finding the Fourth Proportional to 2,142.03, 3,213.20 and 681.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.03 : 3,213.20 = 681.30 : x
2. Step 2: Convert to fraction form
   2,142.03/3,213.20 = 681.30/x
3. Step 3: Cross multiply
   2,142.03x = 3,213.20 × 681.30
4. Step 4: Simplify right side
   2,142.03x = 2,189,149.75
5. Step 5: Solve for x
   x = 2,189,149.75/2,142.03
6. Step 6: Final answer
   x = 1,022.00