Finding the Third Proportional to 1,081.69 and 1,240.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.69 : 1,240.73 = 1,240.73 : x
2. Step 2: Convert to fraction form
   1,081.69/1,240.73 = 1,240.73/x
3. Step 3: Cross multiply
   1,081.69x = 1,240.73 × 1,240.73
4. Step 4: Simplify right side
   1,081.69x = 1,539,421.79
5. Step 5: Solve for x
   x = 1,539,421.79/1,081.69
6. Step 6: Final answer
   x = 1,423.17