Finding the Third Proportional to 16,518 and 21,909

Step by Step Solution

1. Step 1: Write the proportion equation
   16,518 : 21,909 = 21,909 : x
2. Step 2: Convert to fraction form
   16,518/21,909 = 21,909/x
3. Step 3: Cross multiply
   16,518x = 21,909 × 21,909
4. Step 4: Simplify right side
   16,518x = 480,004,281
5. Step 5: Solve for x
   x = 480,004,281/16,518
6. Step 6: Final answer
   x = 29,059.47