Finding the Third Proportional to 320,613 and 500,328.50

Step by Step Solution

1. Step 1: Write the proportion equation
   320,613 : 500,328.50 = 500,328.50 : x
2. Step 2: Convert to fraction form
   320,613/500,328.50 = 500,328.50/x
3. Step 3: Cross multiply
   320,613x = 500,328.50 × 500,328.50
4. Step 4: Simplify right side
   320,613x = 250,328,607,912.25
5. Step 5: Solve for x
   x = 250,328,607,912.25/320,613
6. Step 6: Final answer
   x = 780,781.22