Finding the Fourth Proportional to 2,067.70, 3,100.89 and 680.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,067.70 : 3,100.89 = 680.72 : x
2. Step 2: Convert to fraction form
   2,067.70/3,100.89 = 680.72/x
3. Step 3: Cross multiply
   2,067.70x = 3,100.89 × 680.72
4. Step 4: Simplify right side
   2,067.70x = 2,110,837.84
5. Step 5: Solve for x
   x = 2,110,837.84/2,067.70
6. Step 6: Final answer
   x = 1,020.86