Finding the Fourth Proportional to 1,622.43, 2,434.58 and 685.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,622.43 : 2,434.58 = 685.31 : x
2. Step 2: Convert to fraction form
   1,622.43/2,434.58 = 685.31/x
3. Step 3: Cross multiply
   1,622.43x = 2,434.58 × 685.31
4. Step 4: Simplify right side
   1,622.43x = 1,668,442.02
5. Step 5: Solve for x
   x = 1,668,442.02/1,622.43
6. Step 6: Final answer
   x = 1,028.36