Finding the Third Proportional to 322,406 and 670,978

Step by Step Solution

1. Step 1: Write the proportion equation
   322,406 : 670,978 = 670,978 : x
2. Step 2: Convert to fraction form
   322,406/670,978 = 670,978/x
3. Step 3: Cross multiply
   322,406x = 670,978 × 670,978
4. Step 4: Simplify right side
   322,406x = 450,211,476,484
5. Step 5: Solve for x
   x = 450,211,476,484/322,406
6. Step 6: Final answer
   x = 1,396,411.59