Finding the Fourth Proportional to 1,689.57, 2,535.57 and 960.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,689.57 : 2,535.57 = 960.57 : x
2. Step 2: Convert to fraction form
   1,689.57/2,535.57 = 960.57/x
3. Step 3: Cross multiply
   1,689.57x = 2,535.57 × 960.57
4. Step 4: Simplify right side
   1,689.57x = 2,435,592.47
5. Step 5: Solve for x
   x = 2,435,592.47/1,689.57
6. Step 6: Final answer
   x = 1,441.55