Finding the Third Proportional to 155,560 and 321,488

Step by Step Solution

1. Step 1: Write the proportion equation
   155,560 : 321,488 = 321,488 : x
2. Step 2: Convert to fraction form
   155,560/321,488 = 321,488/x
3. Step 3: Cross multiply
   155,560x = 321,488 × 321,488
4. Step 4: Simplify right side
   155,560x = 103,354,534,144
5. Step 5: Solve for x
   x = 103,354,534,144/155,560
6. Step 6: Final answer
   x = 664,403.02