Finding the Third Proportional to 616.50 and 890.25

Step by Step Solution

1. Step 1: Write the proportion equation
   616.50 : 890.25 = 890.25 : x
2. Step 2: Convert to fraction form
   616.50/890.25 = 890.25/x
3. Step 3: Cross multiply
   616.50x = 890.25 × 890.25
4. Step 4: Simplify right side
   616.50x = 792,545.06
5. Step 5: Solve for x
   x = 792,545.06/616.50
6. Step 6: Final answer
   x = 1,285.56