Finding the Third Proportional to 155,316 and 320,540

Step by Step Solution

1. Step 1: Write the proportion equation
   155,316 : 320,540 = 320,540 : x
2. Step 2: Convert to fraction form
   155,316/320,540 = 320,540/x
3. Step 3: Cross multiply
   155,316x = 320,540 × 320,540
4. Step 4: Simplify right side
   155,316x = 102,745,891,600
5. Step 5: Solve for x
   x = 102,745,891,600/155,316
6. Step 6: Final answer
   x = 661,528.06