Finding the Fourth Proportional to 1,659.69, 2,489.94 and 685.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,659.69 : 2,489.94 = 685.53 : x
2. Step 2: Convert to fraction form
   1,659.69/2,489.94 = 685.53/x
3. Step 3: Cross multiply
   1,659.69x = 2,489.94 × 685.53
4. Step 4: Simplify right side
   1,659.69x = 1,706,928.57
5. Step 5: Solve for x
   x = 1,706,928.57/1,659.69
6. Step 6: Final answer
   x = 1,028.46