Finding the Third Proportional to 316,256 and 667,810

Step by Step Solution

1. Step 1: Write the proportion equation
   316,256 : 667,810 = 667,810 : x
2. Step 2: Convert to fraction form
   316,256/667,810 = 667,810/x
3. Step 3: Cross multiply
   316,256x = 667,810 × 667,810
4. Step 4: Simplify right side
   316,256x = 445,970,196,100
5. Step 5: Solve for x
   x = 445,970,196,100/316,256
6. Step 6: Final answer
   x = 1,410,155.68