Finding the Fourth Proportional to 2,141.28, 3,211.64 and 680.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,141.28 : 3,211.64 = 680.56 : x
2. Step 2: Convert to fraction form
   2,141.28/3,211.64 = 680.56/x
3. Step 3: Cross multiply
   2,141.28x = 3,211.64 × 680.56
4. Step 4: Simplify right side
   2,141.28x = 2,185,713.72
5. Step 5: Solve for x
   x = 2,185,713.72/2,141.28
6. Step 6: Final answer
   x = 1,020.75