Finding the Third Proportional to 107,618 and 212,488

Step by Step Solution

1. Step 1: Write the proportion equation
   107,618 : 212,488 = 212,488 : x
2. Step 2: Convert to fraction form
   107,618/212,488 = 212,488/x
3. Step 3: Cross multiply
   107,618x = 212,488 × 212,488
4. Step 4: Simplify right side
   107,618x = 45,151,150,144
5. Step 5: Solve for x
   x = 45,151,150,144/107,618
6. Step 6: Final answer
   x = 419,550.17