Finding the Fourth Proportional to 1,726.54, 2,588.37 and 685.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,726.54 : 2,588.37 = 685.89 : x
2. Step 2: Convert to fraction form
   1,726.54/2,588.37 = 685.89/x
3. Step 3: Cross multiply
   1,726.54x = 2,588.37 × 685.89
4. Step 4: Simplify right side
   1,726.54x = 1,775,337.10
5. Step 5: Solve for x
   x = 1,775,337.10/1,726.54
6. Step 6: Final answer
   x = 1,028.26