Finding the Third Proportional to 221,640 and 489,936

Step by Step Solution

1. Step 1: Write the proportion equation
   221,640 : 489,936 = 489,936 : x
2. Step 2: Convert to fraction form
   221,640/489,936 = 489,936/x
3. Step 3: Cross multiply
   221,640x = 489,936 × 489,936
4. Step 4: Simplify right side
   221,640x = 240,037,284,096
5. Step 5: Solve for x
   x = 240,037,284,096/221,640
6. Step 6: Final answer
   x = 1,083,005.25