Finding the Fourth Proportional to 1,659.56, 2,488.73 and 685.13

Step by Step Solution

1. Step 1: Write the proportion equation
   1,659.56 : 2,488.73 = 685.13 : x
2. Step 2: Convert to fraction form
   1,659.56/2,488.73 = 685.13/x
3. Step 3: Cross multiply
   1,659.56x = 2,488.73 × 685.13
4. Step 4: Simplify right side
   1,659.56x = 1,705,087.72
5. Step 5: Solve for x
   x = 1,705,087.72/1,659.56
6. Step 6: Final answer
   x = 1,027.44