Finding the Third Proportional to 207,960 and 321,870

Step by Step Solution

1. Step 1: Write the proportion equation
   207,960 : 321,870 = 321,870 : x
2. Step 2: Convert to fraction form
   207,960/321,870 = 321,870/x
3. Step 3: Cross multiply
   207,960x = 321,870 × 321,870
4. Step 4: Simplify right side
   207,960x = 103,600,296,900
5. Step 5: Solve for x
   x = 103,600,296,900/207,960
6. Step 6: Final answer
   x = 498,174.15