Finding the Third Proportional to 315,426 and 672,144

Step by Step Solution

1. Step 1: Write the proportion equation
   315,426 : 672,144 = 672,144 : x
2. Step 2: Convert to fraction form
   315,426/672,144 = 672,144/x
3. Step 3: Cross multiply
   315,426x = 672,144 × 672,144
4. Step 4: Simplify right side
   315,426x = 451,777,556,736
5. Step 5: Solve for x
   x = 451,777,556,736/315,426
6. Step 6: Final answer
   x = 1,432,277.48