Finding the Fourth Proportional to 2,141.79, 3,212.34 and 680.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,141.79 : 3,212.34 = 680.61 : x
2. Step 2: Convert to fraction form
   2,141.79/3,212.34 = 680.61/x
3. Step 3: Cross multiply
   2,141.79x = 3,212.34 × 680.61
4. Step 4: Simplify right side
   2,141.79x = 2,186,350.73
5. Step 5: Solve for x
   x = 2,186,350.73/2,141.79
6. Step 6: Final answer
   x = 1,020.81