Finding the Fourth Proportional to 1,017.35, 1,404.60 and 831.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.35 : 1,404.60 = 831.29 : x
2. Step 2: Convert to fraction form
   1,017.35/1,404.60 = 831.29/x
3. Step 3: Cross multiply
   1,017.35x = 1,404.60 × 831.29
4. Step 4: Simplify right side
   1,017.35x = 1,167,629.93
5. Step 5: Solve for x
   x = 1,167,629.93/1,017.35
6. Step 6: Final answer
   x = 1,147.72