Finding the Third Proportional to 218,304 and 326,107.50

Step by Step Solution

1. Step 1: Write the proportion equation
   218,304 : 326,107.50 = 326,107.50 : x
2. Step 2: Convert to fraction form
   218,304/326,107.50 = 326,107.50/x
3. Step 3: Cross multiply
   218,304x = 326,107.50 × 326,107.50
4. Step 4: Simplify right side
   218,304x = 106,346,101,556.25
5. Step 5: Solve for x
   x = 106,346,101,556.25/218,304
6. Step 6: Final answer
   x = 487,146.83