Finding the Third Proportional to 8,689.50 and 13,608

Step by Step Solution

1. Step 1: Write the proportion equation
   8,689.50 : 13,608 = 13,608 : x
2. Step 2: Convert to fraction form
   8,689.50/13,608 = 13,608/x
3. Step 3: Cross multiply
   8,689.50x = 13,608 × 13,608
4. Step 4: Simplify right side
   8,689.50x = 185,177,664
5. Step 5: Solve for x
   x = 185,177,664/8,689.50
6. Step 6: Final answer
   x = 21,310.51