Finding the Third Proportional to 172,109 and 374,839

Step by Step Solution

1. Step 1: Write the proportion equation
   172,109 : 374,839 = 374,839 : x
2. Step 2: Convert to fraction form
   172,109/374,839 = 374,839/x
3. Step 3: Cross multiply
   172,109x = 374,839 × 374,839
4. Step 4: Simplify right side
   172,109x = 140,504,275,921
5. Step 5: Solve for x
   x = 140,504,275,921/172,109
6. Step 6: Final answer
   x = 816,367.98