Finding the Fourth Proportional to 1,010.68, 1,513.59 and 685.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,010.68 : 1,513.59 = 685.06 : x
2. Step 2: Convert to fraction form
   1,010.68/1,513.59 = 685.06/x
3. Step 3: Cross multiply
   1,010.68x = 1,513.59 × 685.06
4. Step 4: Simplify right side
   1,010.68x = 1,036,899.97
5. Step 5: Solve for x
   x = 1,036,899.97/1,010.68
6. Step 6: Final answer
   x = 1,025.94