Finding the Fourth Proportional to 1,659.37, 2,490.18 and 685.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,659.37 : 2,490.18 = 685.47 : x
2. Step 2: Convert to fraction form
   1,659.37/2,490.18 = 685.47/x
3. Step 3: Cross multiply
   1,659.37x = 2,490.18 × 685.47
4. Step 4: Simplify right side
   1,659.37x = 1,706,941.97
5. Step 5: Solve for x
   x = 1,706,941.97/1,659.37
6. Step 6: Final answer
   x = 1,028.67