Finding the Fourth Proportional to 2,628.55, 3,942.69 and 680.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,628.55 : 3,942.69 = 680.70 : x
2. Step 2: Convert to fraction form
   2,628.55/3,942.69 = 680.70/x
3. Step 3: Cross multiply
   2,628.55x = 3,942.69 × 680.70
4. Step 4: Simplify right side
   2,628.55x = 2,683,805.14
5. Step 5: Solve for x
   x = 2,683,805.14/2,628.55
6. Step 6: Final answer
   x = 1,021.02