Finding the Third Proportional to 221,966 and 489,172

Step by Step Solution

1. Step 1: Write the proportion equation
   221,966 : 489,172 = 489,172 : x
2. Step 2: Convert to fraction form
   221,966/489,172 = 489,172/x
3. Step 3: Cross multiply
   221,966x = 489,172 × 489,172
4. Step 4: Simplify right side
   221,966x = 239,289,245,584
5. Step 5: Solve for x
   x = 239,289,245,584/221,966
6. Step 6: Final answer
   x = 1,078,044.59