Finding the Third Proportional to 155,226 and 321,570

Step by Step Solution

1. Step 1: Write the proportion equation
   155,226 : 321,570 = 321,570 : x
2. Step 2: Convert to fraction form
   155,226/321,570 = 321,570/x
3. Step 3: Cross multiply
   155,226x = 321,570 × 321,570
4. Step 4: Simplify right side
   155,226x = 103,407,264,900
5. Step 5: Solve for x
   x = 103,407,264,900/155,226
6. Step 6: Final answer
   x = 666,172.32