Finding the Third Proportional to 139,760 and 221,412

Step by Step Solution

1. Step 1: Write the proportion equation
   139,760 : 221,412 = 221,412 : x
2. Step 2: Convert to fraction form
   139,760/221,412 = 221,412/x
3. Step 3: Cross multiply
   139,760x = 221,412 × 221,412
4. Step 4: Simplify right side
   139,760x = 49,023,273,744
5. Step 5: Solve for x
   x = 49,023,273,744/139,760
6. Step 6: Final answer
   x = 350,767.56