Finding the Fourth Proportional to 1,911.98, 2,868.89 and 680.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,911.98 : 2,868.89 = 680.28 : x
2. Step 2: Convert to fraction form
   1,911.98/2,868.89 = 680.28/x
3. Step 3: Cross multiply
   1,911.98x = 2,868.89 × 680.28
4. Step 4: Simplify right side
   1,911.98x = 1,951,645.09
5. Step 5: Solve for x
   x = 1,951,645.09/1,911.98
6. Step 6: Final answer
   x = 1,020.75