Finding the Third Proportional to 16,814 and 20,558

Step by Step Solution

1. Step 1: Write the proportion equation
   16,814 : 20,558 = 20,558 : x
2. Step 2: Convert to fraction form
   16,814/20,558 = 20,558/x
3. Step 3: Cross multiply
   16,814x = 20,558 × 20,558
4. Step 4: Simplify right side
   16,814x = 422,631,364
5. Step 5: Solve for x
   x = 422,631,364/16,814
6. Step 6: Final answer
   x = 25,135.68