Finding the Third Proportional to 139,340 and 212,270

Step by Step Solution

1. Step 1: Write the proportion equation
   139,340 : 212,270 = 212,270 : x
2. Step 2: Convert to fraction form
   139,340/212,270 = 212,270/x
3. Step 3: Cross multiply
   139,340x = 212,270 × 212,270
4. Step 4: Simplify right side
   139,340x = 45,058,552,900
5. Step 5: Solve for x
   x = 45,058,552,900/139,340
6. Step 6: Final answer
   x = 323,371.27