Finding the Third Proportional to 316,636 and 666,074

Step by Step Solution

1. Step 1: Write the proportion equation
   316,636 : 666,074 = 666,074 : x
2. Step 2: Convert to fraction form
   316,636/666,074 = 666,074/x
3. Step 3: Cross multiply
   316,636x = 666,074 × 666,074
4. Step 4: Simplify right side
   316,636x = 443,654,573,476
5. Step 5: Solve for x
   x = 443,654,573,476/316,636
6. Step 6: Final answer
   x = 1,401,150.13