Finding the Fourth Proportional to 1,010.93, 1,517.61 and 685.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,010.93 : 1,517.61 = 685.31 : x
2. Step 2: Convert to fraction form
   1,010.93/1,517.61 = 685.31/x
3. Step 3: Cross multiply
   1,010.93x = 1,517.61 × 685.31
4. Step 4: Simplify right side
   1,010.93x = 1,040,033.31
5. Step 5: Solve for x
   x = 1,040,033.31/1,010.93
6. Step 6: Final answer
   x = 1,028.79