Finding the Fourth Proportional to 2,142.54, 3,212.55 and 680.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.54 : 3,212.55 = 680.94 : x
2. Step 2: Convert to fraction form
   2,142.54/3,212.55 = 680.94/x
3. Step 3: Cross multiply
   2,142.54x = 3,212.55 × 680.94
4. Step 4: Simplify right side
   2,142.54x = 2,187,553.80
5. Step 5: Solve for x
   x = 2,187,553.80/2,142.54
6. Step 6: Final answer
   x = 1,021.01