Finding the Third Proportional to 142,440 and 221,436

Step by Step Solution

1. Step 1: Write the proportion equation
   142,440 : 221,436 = 221,436 : x
2. Step 2: Convert to fraction form
   142,440/221,436 = 221,436/x
3. Step 3: Cross multiply
   142,440x = 221,436 × 221,436
4. Step 4: Simplify right side
   142,440x = 49,033,902,096
5. Step 5: Solve for x
   x = 49,033,902,096/142,440
6. Step 6: Final answer
   x = 344,242.50