Finding the Fourth Proportional to 1,244.78, 1,717.83 and 685.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,244.78 : 1,717.83 = 685.29 : x
2. Step 2: Convert to fraction form
   1,244.78/1,717.83 = 685.29/x
3. Step 3: Cross multiply
   1,244.78x = 1,717.83 × 685.29
4. Step 4: Simplify right side
   1,244.78x = 1,177,211.72
5. Step 5: Solve for x
   x = 1,177,211.72/1,244.78
6. Step 6: Final answer
   x = 945.72