Finding the Third Proportional to 11,760 and 21,855

Step by Step Solution

1. Step 1: Write the proportion equation
   11,760 : 21,855 = 21,855 : x
2. Step 2: Convert to fraction form
   11,760/21,855 = 21,855/x
3. Step 3: Cross multiply
   11,760x = 21,855 × 21,855
4. Step 4: Simplify right side
   11,760x = 477,641,025
5. Step 5: Solve for x
   x = 477,641,025/11,760
6. Step 6: Final answer
   x = 40,615.73