Finding the Fourth Proportional to 2,057.57, 3,085.71 and 689.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057.57 : 3,085.71 = 689.25 : x
2. Step 2: Convert to fraction form
   2,057.57/3,085.71 = 689.25/x
3. Step 3: Cross multiply
   2,057.57x = 3,085.71 × 689.25
4. Step 4: Simplify right side
   2,057.57x = 2,126,825.62
5. Step 5: Solve for x
   x = 2,126,825.62/2,057.57
6. Step 6: Final answer
   x = 1,033.66