Finding the Fourth Proportional to 2,142.02, 3,213.17 and 681.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.02 : 3,213.17 = 681.23 : x
2. Step 2: Convert to fraction form
   2,142.02/3,213.17 = 681.23/x
3. Step 3: Cross multiply
   2,142.02x = 3,213.17 × 681.23
4. Step 4: Simplify right side
   2,142.02x = 2,188,904.39
5. Step 5: Solve for x
   x = 2,188,904.39/2,142.02
6. Step 6: Final answer
   x = 1,021.89