Finding the Third Proportional to 225,555 and 489,978

Step by Step Solution

1. Step 1: Write the proportion equation
   225,555 : 489,978 = 489,978 : x
2. Step 2: Convert to fraction form
   225,555/489,978 = 489,978/x
3. Step 3: Cross multiply
   225,555x = 489,978 × 489,978
4. Step 4: Simplify right side
   225,555x = 240,078,440,484
5. Step 5: Solve for x
   x = 240,078,440,484/225,555
6. Step 6: Final answer
   x = 1,064,389.80