Finding the Third Proportional to 155,566 and 321,500

Step by Step Solution

1. Step 1: Write the proportion equation
   155,566 : 321,500 = 321,500 : x
2. Step 2: Convert to fraction form
   155,566/321,500 = 321,500/x
3. Step 3: Cross multiply
   155,566x = 321,500 × 321,500
4. Step 4: Simplify right side
   155,566x = 103,362,250,000
5. Step 5: Solve for x
   x = 103,362,250,000/155,566
6. Step 6: Final answer
   x = 664,427.00