Finding the Fourth Proportional to 1,078.62, 1,487.93 and 685.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.62 : 1,487.93 = 685.23 : x
2. Step 2: Convert to fraction form
   1,078.62/1,487.93 = 685.23/x
3. Step 3: Cross multiply
   1,078.62x = 1,487.93 × 685.23
4. Step 4: Simplify right side
   1,078.62x = 1,019,574.27
5. Step 5: Solve for x
   x = 1,019,574.27/1,078.62
6. Step 6: Final answer
   x = 945.26