Finding the Third Proportional to 300,668 and 647,848

Step by Step Solution

1. Step 1: Write the proportion equation
   300,668 : 647,848 = 647,848 : x
2. Step 2: Convert to fraction form
   300,668/647,848 = 647,848/x
3. Step 3: Cross multiply
   300,668x = 647,848 × 647,848
4. Step 4: Simplify right side
   300,668x = 419,707,031,104
5. Step 5: Solve for x
   x = 419,707,031,104/300,668
6. Step 6: Final answer
   x = 1,395,915.20