Finding the Third Proportional to 316,618 and 666,036

Step by Step Solution

1. Step 1: Write the proportion equation
   316,618 : 666,036 = 666,036 : x
2. Step 2: Convert to fraction form
   316,618/666,036 = 666,036/x
3. Step 3: Cross multiply
   316,618x = 666,036 × 666,036
4. Step 4: Simplify right side
   316,618x = 443,603,953,296
5. Step 5: Solve for x
   x = 443,603,953,296/316,618
6. Step 6: Final answer
   x = 1,401,069.91