Finding the Third Proportional to 139,079 and 209,267

Step by Step Solution

1. Step 1: Write the proportion equation
   139,079 : 209,267 = 209,267 : x
2. Step 2: Convert to fraction form
   139,079/209,267 = 209,267/x
3. Step 3: Cross multiply
   139,079x = 209,267 × 209,267
4. Step 4: Simplify right side
   139,079x = 43,792,677,289
5. Step 5: Solve for x
   x = 43,792,677,289/139,079
6. Step 6: Final answer
   x = 314,876.27