Finding the Fourth Proportional to 2,628.72, 3,943.24 and 680.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,628.72 : 3,943.24 = 680.96 : x
2. Step 2: Convert to fraction form
   2,628.72/3,943.24 = 680.96/x
3. Step 3: Cross multiply
   2,628.72x = 3,943.24 × 680.96
4. Step 4: Simplify right side
   2,628.72x = 2,685,188.71
5. Step 5: Solve for x
   x = 2,685,188.71/2,628.72
6. Step 6: Final answer
   x = 1,021.48