Finding the Third Proportional to 210,872 and 328,404

Step by Step Solution

1. Step 1: Write the proportion equation
   210,872 : 328,404 = 328,404 : x
2. Step 2: Convert to fraction form
   210,872/328,404 = 328,404/x
3. Step 3: Cross multiply
   210,872x = 328,404 × 328,404
4. Step 4: Simplify right side
   210,872x = 107,849,187,216
5. Step 5: Solve for x
   x = 107,849,187,216/210,872
6. Step 6: Final answer
   x = 511,443.85