Finding the Third Proportional to 17,644.50 and 19,489.50

Step by Step Solution

1. Step 1: Write the proportion equation
   17,644.50 : 19,489.50 = 19,489.50 : x
2. Step 2: Convert to fraction form
   17,644.50/19,489.50 = 19,489.50/x
3. Step 3: Cross multiply
   17,644.50x = 19,489.50 × 19,489.50
4. Step 4: Simplify right side
   17,644.50x = 379,840,610.25
5. Step 5: Solve for x
   x = 379,840,610.25/17,644.50
6. Step 6: Final answer
   x = 21,527.42