Finding the Third Proportional to 215,506.50 and 324,900

Step by Step Solution

1. Step 1: Write the proportion equation
   215,506.50 : 324,900 = 324,900 : x
2. Step 2: Convert to fraction form
   215,506.50/324,900 = 324,900/x
3. Step 3: Cross multiply
   215,506.50x = 324,900 × 324,900
4. Step 4: Simplify right side
   215,506.50x = 105,560,010,000
5. Step 5: Solve for x
   x = 105,560,010,000/215,506.50
6. Step 6: Final answer
   x = 489,822.86