Finding the Third Proportional to 646,375 and 978,561

Step by Step Solution

1. Step 1: Write the proportion equation
   646,375 : 978,561 = 978,561 : x
2. Step 2: Convert to fraction form
   646,375/978,561 = 978,561/x
3. Step 3: Cross multiply
   646,375x = 978,561 × 978,561
4. Step 4: Simplify right side
   646,375x = 957,581,630,721
5. Step 5: Solve for x
   x = 957,581,630,721/646,375
6. Step 6: Final answer
   x = 1,481,464.52