Finding the Third Proportional to 219,612 and 321,039

Step by Step Solution

1. Step 1: Write the proportion equation
   219,612 : 321,039 = 321,039 : x
2. Step 2: Convert to fraction form
   219,612/321,039 = 321,039/x
3. Step 3: Cross multiply
   219,612x = 321,039 × 321,039
4. Step 4: Simplify right side
   219,612x = 103,066,039,521
5. Step 5: Solve for x
   x = 103,066,039,521/219,612
6. Step 6: Final answer
   x = 469,309.69