Finding the Third Proportional to 328,624 and 672,820

Step by Step Solution

1. Step 1: Write the proportion equation
   328,624 : 672,820 = 672,820 : x
2. Step 2: Convert to fraction form
   328,624/672,820 = 672,820/x
3. Step 3: Cross multiply
   328,624x = 672,820 × 672,820
4. Step 4: Simplify right side
   328,624x = 452,686,752,400
5. Step 5: Solve for x
   x = 452,686,752,400/328,624
6. Step 6: Final answer
   x = 1,377,521.89