Finding the Third Proportional to 328,632 and 672,840

Step by Step Solution

1. Step 1: Write the proportion equation
   328,632 : 672,840 = 672,840 : x
2. Step 2: Convert to fraction form
   328,632/672,840 = 672,840/x
3. Step 3: Cross multiply
   328,632x = 672,840 × 672,840
4. Step 4: Simplify right side
   328,632x = 452,713,665,600
5. Step 5: Solve for x
   x = 452,713,665,600/328,632
6. Step 6: Final answer
   x = 1,377,570.25