Finding the Third Proportional to 316,760 and 672,388

Step by Step Solution

1. Step 1: Write the proportion equation
   316,760 : 672,388 = 672,388 : x
2. Step 2: Convert to fraction form
   316,760/672,388 = 672,388/x
3. Step 3: Cross multiply
   316,760x = 672,388 × 672,388
4. Step 4: Simplify right side
   316,760x = 452,105,622,544
5. Step 5: Solve for x
   x = 452,105,622,544/316,760
6. Step 6: Final answer
   x = 1,427,281.29