Finding the Third Proportional to 21,720 and 34,554

Step by Step Solution

1. Step 1: Write the proportion equation
   21,720 : 34,554 = 34,554 : x
2. Step 2: Convert to fraction form
   21,720/34,554 = 34,554/x
3. Step 3: Cross multiply
   21,720x = 34,554 × 34,554
4. Step 4: Simplify right side
   21,720x = 1,193,978,916
5. Step 5: Solve for x
   x = 1,193,978,916/21,720
6. Step 6: Final answer
   x = 54,971.40