Finding the Third Proportional to 300,326 and 647,188

Step by Step Solution

1. Step 1: Write the proportion equation
   300,326 : 647,188 = 647,188 : x
2. Step 2: Convert to fraction form
   300,326/647,188 = 647,188/x
3. Step 3: Cross multiply
   300,326x = 647,188 × 647,188
4. Step 4: Simplify right side
   300,326x = 418,852,307,344
5. Step 5: Solve for x
   x = 418,852,307,344/300,326
6. Step 6: Final answer
   x = 1,394,658.83