Finding the Third Proportional to 189,389 and 418,144

Step by Step Solution

1. Step 1: Write the proportion equation
   189,389 : 418,144 = 418,144 : x
2. Step 2: Convert to fraction form
   189,389/418,144 = 418,144/x
3. Step 3: Cross multiply
   189,389x = 418,144 × 418,144
4. Step 4: Simplify right side
   189,389x = 174,844,404,736
5. Step 5: Solve for x
   x = 174,844,404,736/189,389
6. Step 6: Final answer
   x = 923,202.53