Finding the Third Proportional to 111,618 and 242,109

Step by Step Solution

1. Step 1: Write the proportion equation
   111,618 : 242,109 = 242,109 : x
2. Step 2: Convert to fraction form
   111,618/242,109 = 242,109/x
3. Step 3: Cross multiply
   111,618x = 242,109 × 242,109
4. Step 4: Simplify right side
   111,618x = 58,616,767,881
5. Step 5: Solve for x
   x = 58,616,767,881/111,618
6. Step 6: Final answer
   x = 525,155.15