Finding the Fourth Proportional to 1,689.43, 2,329.17 and 1,291.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,689.43 : 2,329.17 = 1,291.33 : x
2. Step 2: Convert to fraction form
   1,689.43/2,329.17 = 1,291.33/x
3. Step 3: Cross multiply
   1,689.43x = 2,329.17 × 1,291.33
4. Step 4: Simplify right side
   1,689.43x = 3,007,727.10
5. Step 5: Solve for x
   x = 3,007,727.10/1,689.43
6. Step 6: Final answer
   x = 1,780.32