Finding the Fourth Proportional to 1,426.62, 2,139.09 and 686.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,426.62 : 2,139.09 = 686.04 : x
2. Step 2: Convert to fraction form
   1,426.62/2,139.09 = 686.04/x
3. Step 3: Cross multiply
   1,426.62x = 2,139.09 × 686.04
4. Step 4: Simplify right side
   1,426.62x = 1,467,501.30
5. Step 5: Solve for x
   x = 1,467,501.30/1,426.62
6. Step 6: Final answer
   x = 1,028.66