Finding the Third Proportional to 142,443 and 220,554

Step by Step Solution

1. Step 1: Write the proportion equation
   142,443 : 220,554 = 220,554 : x
2. Step 2: Convert to fraction form
   142,443/220,554 = 220,554/x
3. Step 3: Cross multiply
   142,443x = 220,554 × 220,554
4. Step 4: Simplify right side
   142,443x = 48,644,066,916
5. Step 5: Solve for x
   x = 48,644,066,916/142,443
6. Step 6: Final answer
   x = 341,498.47