Finding the Fourth Proportional to 1,983.86, 2,975.77 and 685.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,983.86 : 2,975.77 = 685.31 : x
2. Step 2: Convert to fraction form
   1,983.86/2,975.77 = 685.31/x
3. Step 3: Cross multiply
   1,983.86x = 2,975.77 × 685.31
4. Step 4: Simplify right side
   1,983.86x = 2,039,308.35
5. Step 5: Solve for x
   x = 2,039,308.35/1,983.86
6. Step 6: Final answer
   x = 1,027.95