Finding the Fourth Proportional to 1,983.89, 2,976.30 and 685.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,983.89 : 2,976.30 = 685.37 : x
2. Step 2: Convert to fraction form
   1,983.89/2,976.30 = 685.37/x
3. Step 3: Cross multiply
   1,983.89x = 2,976.30 × 685.37
4. Step 4: Simplify right side
   1,983.89x = 2,039,851.85
5. Step 5: Solve for x
   x = 2,039,851.85/1,983.89
6. Step 6: Final answer
   x = 1,028.21