Finding the Third Proportional to 669.50 and 980.50

Step by Step Solution

1. Step 1: Write the proportion equation
   669.50 : 980.50 = 980.50 : x
2. Step 2: Convert to fraction form
   669.50/980.50 = 980.50/x
3. Step 3: Cross multiply
   669.50x = 980.50 × 980.50
4. Step 4: Simplify right side
   669.50x = 961,380.25
5. Step 5: Solve for x
   x = 961,380.25/669.50
6. Step 6: Final answer
   x = 1,435.97