Finding the Third Proportional to 17,118 and 18,900

Step by Step Solution

1. Step 1: Write the proportion equation
   17,118 : 18,900 = 18,900 : x
2. Step 2: Convert to fraction form
   17,118/18,900 = 18,900/x
3. Step 3: Cross multiply
   17,118x = 18,900 × 18,900
4. Step 4: Simplify right side
   17,118x = 357,210,000
5. Step 5: Solve for x
   x = 357,210,000/17,118
6. Step 6: Final answer
   x = 20,867.51