Finding the Third Proportional to 864,443 and 1,268,638

Step by Step Solution

1. Step 1: Write the proportion equation
   864,443 : 1,268,638 = 1,268,638 : x
2. Step 2: Convert to fraction form
   864,443/1,268,638 = 1,268,638/x
3. Step 3: Cross multiply
   864,443x = 1,268,638 × 1,268,638
4. Step 4: Simplify right side
   864,443x = 1,609,442,375,044
5. Step 5: Solve for x
   x = 1,609,442,375,044/864,443
6. Step 6: Final answer
   x = 1,861,825.91