Finding the Third Proportional to 80,439 and 173,211

Step by Step Solution

1. Step 1: Write the proportion equation
   80,439 : 173,211 = 173,211 : x
2. Step 2: Convert to fraction form
   80,439/173,211 = 173,211/x
3. Step 3: Cross multiply
   80,439x = 173,211 × 173,211
4. Step 4: Simplify right side
   80,439x = 30,002,050,521
5. Step 5: Solve for x
   x = 30,002,050,521/80,439
6. Step 6: Final answer
   x = 372,978.91