Finding the Third Proportional to 221,377.50 and 489,270

Step by Step Solution

1. Step 1: Write the proportion equation
   221,377.50 : 489,270 = 489,270 : x
2. Step 2: Convert to fraction form
   221,377.50/489,270 = 489,270/x
3. Step 3: Cross multiply
   221,377.50x = 489,270 × 489,270
4. Step 4: Simplify right side
   221,377.50x = 239,385,132,900
5. Step 5: Solve for x
   x = 239,385,132,900/221,377.50
6. Step 6: Final answer
   x = 1,081,343.56