Finding the Third Proportional to 17,490 and 18,930

Step by Step Solution

1. Step 1: Write the proportion equation
   17,490 : 18,930 = 18,930 : x
2. Step 2: Convert to fraction form
   17,490/18,930 = 18,930/x
3. Step 3: Cross multiply
   17,490x = 18,930 × 18,930
4. Step 4: Simplify right side
   17,490x = 358,344,900
5. Step 5: Solve for x
   x = 358,344,900/17,490
6. Step 6: Final answer
   x = 20,488.56