Finding the Fourth Proportional to 1,272.94, 1,757.61 and 831.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,272.94 : 1,757.61 = 831.10 : x
2. Step 2: Convert to fraction form
   1,272.94/1,757.61 = 831.10/x
3. Step 3: Cross multiply
   1,272.94x = 1,757.61 × 831.10
4. Step 4: Simplify right side
   1,272.94x = 1,460,749.67
5. Step 5: Solve for x
   x = 1,460,749.67/1,272.94
6. Step 6: Final answer
   x = 1,147.54