Finding the Third Proportional to 16,500 and 18,120

Step by Step Solution

1. Step 1: Write the proportion equation
   16,500 : 18,120 = 18,120 : x
2. Step 2: Convert to fraction form
   16,500/18,120 = 18,120/x
3. Step 3: Cross multiply
   16,500x = 18,120 × 18,120
4. Step 4: Simplify right side
   16,500x = 328,334,400
5. Step 5: Solve for x
   x = 328,334,400/16,500
6. Step 6: Final answer
   x = 19,899.05