Finding the Third Proportional to 7,766 and 12,603

Step by Step Solution

1. Step 1: Write the proportion equation
   7,766 : 12,603 = 12,603 : x
2. Step 2: Convert to fraction form
   7,766/12,603 = 12,603/x
3. Step 3: Cross multiply
   7,766x = 12,603 × 12,603
4. Step 4: Simplify right side
   7,766x = 158,835,609
5. Step 5: Solve for x
   x = 158,835,609/7,766
6. Step 6: Final answer
   x = 20,452.69