Finding the Third Proportional to 142,489 and 222,359

Step by Step Solution

1. Step 1: Write the proportion equation
   142,489 : 222,359 = 222,359 : x
2. Step 2: Convert to fraction form
   142,489/222,359 = 222,359/x
3. Step 3: Cross multiply
   142,489x = 222,359 × 222,359
4. Step 4: Simplify right side
   142,489x = 49,443,524,881
5. Step 5: Solve for x
   x = 49,443,524,881/142,489
6. Step 6: Final answer
   x = 346,998.89