Finding the Third Proportional to 109,980 and 221,665.50

Step by Step Solution

1. Step 1: Write the proportion equation
   109,980 : 221,665.50 = 221,665.50 : x
2. Step 2: Convert to fraction form
   109,980/221,665.50 = 221,665.50/x
3. Step 3: Cross multiply
   109,980x = 221,665.50 × 221,665.50
4. Step 4: Simplify right side
   109,980x = 49,135,593,890.25
5. Step 5: Solve for x
   x = 49,135,593,890.25/109,980
6. Step 6: Final answer
   x = 446,768.45