Finding the Fourth Proportional to 1,426.35, 2,138.28 and 685.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,426.35 : 2,138.28 = 685.59 : x
2. Step 2: Convert to fraction form
   1,426.35/2,138.28 = 685.59/x
3. Step 3: Cross multiply
   1,426.35x = 2,138.28 × 685.59
4. Step 4: Simplify right side
   1,426.35x = 1,465,987.02
5. Step 5: Solve for x
   x = 1,465,987.02/1,426.35
6. Step 6: Final answer
   x = 1,027.79