Finding the Third Proportional to 16,820 and 18,620

Step by Step Solution

1. Step 1: Write the proportion equation
   16,820 : 18,620 = 18,620 : x
2. Step 2: Convert to fraction form
   16,820/18,620 = 18,620/x
3. Step 3: Cross multiply
   16,820x = 18,620 × 18,620
4. Step 4: Simplify right side
   16,820x = 346,704,400
5. Step 5: Solve for x
   x = 346,704,400/16,820
6. Step 6: Final answer
   x = 20,612.63