Finding the Third Proportional to 7,760.25 and 12,489.75

Step by Step Solution

1. Step 1: Write the proportion equation
   7,760.25 : 12,489.75 = 12,489.75 : x
2. Step 2: Convert to fraction form
   7,760.25/12,489.75 = 12,489.75/x
3. Step 3: Cross multiply
   7,760.25x = 12,489.75 × 12,489.75
4. Step 4: Simplify right side
   7,760.25x = 155,993,855.06
5. Step 5: Solve for x
   x = 155,993,855.06/7,760.25
6. Step 6: Final answer
   x = 20,101.65