Finding the Fourth Proportional to 2,066.80, 3,100.62 and 680.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,066.80 : 3,100.62 = 680.20 : x
2. Step 2: Convert to fraction form
   2,066.80/3,100.62 = 680.20/x
3. Step 3: Cross multiply
   2,066.80x = 3,100.62 × 680.20
4. Step 4: Simplify right side
   2,066.80x = 2,109,041.72
5. Step 5: Solve for x
   x = 2,109,041.72/2,066.80
6. Step 6: Final answer
   x = 1,020.44