Finding the Third Proportional to 319,874.50 and 679,109

Step by Step Solution

1. Step 1: Write the proportion equation
   319,874.50 : 679,109 = 679,109 : x
2. Step 2: Convert to fraction form
   319,874.50/679,109 = 679,109/x
3. Step 3: Cross multiply
   319,874.50x = 679,109 × 679,109
4. Step 4: Simplify right side
   319,874.50x = 461,189,033,881
5. Step 5: Solve for x
   x = 461,189,033,881/319,874.50
6. Step 6: Final answer
   x = 1,441,781.18