Finding the Third Proportional to 312,417 and 672,300

Step by Step Solution

1. Step 1: Write the proportion equation
   312,417 : 672,300 = 672,300 : x
2. Step 2: Convert to fraction form
   312,417/672,300 = 672,300/x
3. Step 3: Cross multiply
   312,417x = 672,300 × 672,300
4. Step 4: Simplify right side
   312,417x = 451,987,290,000
5. Step 5: Solve for x
   x = 451,987,290,000/312,417
6. Step 6: Final answer
   x = 1,446,743.58