Finding the Third Proportional to 831.52 and 1,285.72

Step by Step Solution

1. Step 1: Write the proportion equation
   831.52 : 1,285.72 = 1,285.72 : x
2. Step 2: Convert to fraction form
   831.52/1,285.72 = 1,285.72/x
3. Step 3: Cross multiply
   831.52x = 1,285.72 × 1,285.72
4. Step 4: Simplify right side
   831.52x = 1,653,067.68
5. Step 5: Solve for x
   x = 1,653,067.68/831.52
6. Step 6: Final answer
   x = 1,988.02