Finding the Third Proportional to 638,618 and 1,064,320

Step by Step Solution

1. Step 1: Write the proportion equation
   638,618 : 1,064,320 = 1,064,320 : x
2. Step 2: Convert to fraction form
   638,618/1,064,320 = 1,064,320/x
3. Step 3: Cross multiply
   638,618x = 1,064,320 × 1,064,320
4. Step 4: Simplify right side
   638,618x = 1,132,777,062,400
5. Step 5: Solve for x
   x = 1,132,777,062,400/638,618
6. Step 6: Final answer
   x = 1,773,794.45