Finding the Third Proportional to 21,120 and 30,912

Step by Step Solution

1. Step 1: Write the proportion equation
   21,120 : 30,912 = 30,912 : x
2. Step 2: Convert to fraction form
   21,120/30,912 = 30,912/x
3. Step 3: Cross multiply
   21,120x = 30,912 × 30,912
4. Step 4: Simplify right side
   21,120x = 955,551,744
5. Step 5: Solve for x
   x = 955,551,744/21,120
6. Step 6: Final answer
   x = 45,243.93