Finding the Fourth Proportional to 2,066.65, 3,100.37 and 680.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,066.65 : 3,100.37 = 680.39 : x
2. Step 2: Convert to fraction form
   2,066.65/3,100.37 = 680.39/x
3. Step 3: Cross multiply
   2,066.65x = 3,100.37 × 680.39
4. Step 4: Simplify right side
   2,066.65x = 2,109,452.99
5. Step 5: Solve for x
   x = 2,109,452.99/2,066.65
6. Step 6: Final answer
   x = 1,020.71