Finding the Third Proportional to 17,298.56 and 18,918.56

Step by Step Solution

1. Step 1: Write the proportion equation
   17,298.56 : 18,918.56 = 18,918.56 : x
2. Step 2: Convert to fraction form
   17,298.56/18,918.56 = 18,918.56/x
3. Step 3: Cross multiply
   17,298.56x = 18,918.56 × 18,918.56
4. Step 4: Simplify right side
   17,298.56x = 357,912,007.07
5. Step 5: Solve for x
   x = 357,912,007.07/17,298.56
6. Step 6: Final answer
   x = 20,690.27