Finding the Third Proportional to 638,618 and 1,064,321

Step by Step Solution

1. Step 1: Write the proportion equation
   638,618 : 1,064,321 = 1,064,321 : x
2. Step 2: Convert to fraction form
   638,618/1,064,321 = 1,064,321/x
3. Step 3: Cross multiply
   638,618x = 1,064,321 × 1,064,321
4. Step 4: Simplify right side
   638,618x = 1,132,779,191,041
5. Step 5: Solve for x
   x = 1,132,779,191,041/638,618
6. Step 6: Final answer
   x = 1,773,797.78