Finding the Fourth Proportional to 1,272.51, 1,756.22 and 831.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,272.51 : 1,756.22 = 831.69 : x
2. Step 2: Convert to fraction form
   1,272.51/1,756.22 = 831.69/x
3. Step 3: Cross multiply
   1,272.51x = 1,756.22 × 831.69
4. Step 4: Simplify right side
   1,272.51x = 1,460,626.45
5. Step 5: Solve for x
   x = 1,460,626.45/1,272.51
6. Step 6: Final answer
   x = 1,147.83