Finding the Third Proportional to 326,530 and 470,317.50

Step by Step Solution

1. Step 1: Write the proportion equation
   326,530 : 470,317.50 = 470,317.50 : x
2. Step 2: Convert to fraction form
   326,530/470,317.50 = 470,317.50/x
3. Step 3: Cross multiply
   326,530x = 470,317.50 × 470,317.50
4. Step 4: Simplify right side
   326,530x = 221,198,550,806.25
5. Step 5: Solve for x
   x = 221,198,550,806.25/326,530
6. Step 6: Final answer
   x = 677,421.83