Finding the Fourth Proportional to 2,067.72, 3,101.76 and 680.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,067.72 : 3,101.76 = 680.76 : x
2. Step 2: Convert to fraction form
   2,067.72/3,101.76 = 680.76/x
3. Step 3: Cross multiply
   2,067.72x = 3,101.76 × 680.76
4. Step 4: Simplify right side
   2,067.72x = 2,111,554.14
5. Step 5: Solve for x
   x = 2,111,554.14/2,067.72
6. Step 6: Final answer
   x = 1,021.20