Finding the Third Proportional to 139,338 and 212,267

Step by Step Solution

1. Step 1: Write the proportion equation
   139,338 : 212,267 = 212,267 : x
2. Step 2: Convert to fraction form
   139,338/212,267 = 212,267/x
3. Step 3: Cross multiply
   139,338x = 212,267 × 212,267
4. Step 4: Simplify right side
   139,338x = 45,057,279,289
5. Step 5: Solve for x
   x = 45,057,279,289/139,338
6. Step 6: Final answer
   x = 323,366.77