Finding the Third Proportional to 326,605 and 666,331.50

Step by Step Solution

1. Step 1: Write the proportion equation
   326,605 : 666,331.50 = 666,331.50 : x
2. Step 2: Convert to fraction form
   326,605/666,331.50 = 666,331.50/x
3. Step 3: Cross multiply
   326,605x = 666,331.50 × 666,331.50
4. Step 4: Simplify right side
   326,605x = 443,997,667,892.25
5. Step 5: Solve for x
   x = 443,997,667,892.25/326,605
6. Step 6: Final answer
   x = 1,359,433.16