Finding the Third Proportional to 154,568 and 320,980

Step by Step Solution

1. Step 1: Write the proportion equation
   154,568 : 320,980 = 320,980 : x
2. Step 2: Convert to fraction form
   154,568/320,980 = 320,980/x
3. Step 3: Cross multiply
   154,568x = 320,980 × 320,980
4. Step 4: Simplify right side
   154,568x = 103,028,160,400
5. Step 5: Solve for x
   x = 103,028,160,400/154,568
6. Step 6: Final answer
   x = 666,555.56