Finding the Third Proportional to 309,608 and 473,280

Step by Step Solution

1. Step 1: Write the proportion equation
   309,608 : 473,280 = 473,280 : x
2. Step 2: Convert to fraction form
   309,608/473,280 = 473,280/x
3. Step 3: Cross multiply
   309,608x = 473,280 × 473,280
4. Step 4: Simplify right side
   309,608x = 223,993,958,400
5. Step 5: Solve for x
   x = 223,993,958,400/309,608
6. Step 6: Final answer
   x = 723,476.00