Finding the Third Proportional to 16,645.50 and 21,915

Step by Step Solution

1. Step 1: Write the proportion equation
   16,645.50 : 21,915 = 21,915 : x
2. Step 2: Convert to fraction form
   16,645.50/21,915 = 21,915/x
3. Step 3: Cross multiply
   16,645.50x = 21,915 × 21,915
4. Step 4: Simplify right side
   16,645.50x = 480,267,225
5. Step 5: Solve for x
   x = 480,267,225/16,645.50
6. Step 6: Final answer
   x = 28,852.68