Finding the Fourth Proportional to 1,983.88, 2,976.12 and 685.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,983.88 : 2,976.12 = 685.72 : x
2. Step 2: Convert to fraction form
   1,983.88/2,976.12 = 685.72/x
3. Step 3: Cross multiply
   1,983.88x = 2,976.12 × 685.72
4. Step 4: Simplify right side
   1,983.88x = 2,040,785.01
5. Step 5: Solve for x
   x = 2,040,785.01/1,983.88
6. Step 6: Final answer
   x = 1,028.68