Finding the Fourth Proportional to 2,067.61, 3,100.79 and 680.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,067.61 : 3,100.79 = 680.69 : x
2. Step 2: Convert to fraction form
   2,067.61/3,100.79 = 680.69/x
3. Step 3: Cross multiply
   2,067.61x = 3,100.79 × 680.69
4. Step 4: Simplify right side
   2,067.61x = 2,110,676.75
5. Step 5: Solve for x
   x = 2,110,676.75/2,067.61
6. Step 6: Final answer
   x = 1,020.83