Finding the Third Proportional to 8,640 and 13,500

Step by Step Solution

1. Step 1: Write the proportion equation
   8,640 : 13,500 = 13,500 : x
2. Step 2: Convert to fraction form
   8,640/13,500 = 13,500/x
3. Step 3: Cross multiply
   8,640x = 13,500 × 13,500
4. Step 4: Simplify right side
   8,640x = 182,250,000
5. Step 5: Solve for x
   x = 182,250,000/8,640
6. Step 6: Final answer
   x = 21,093.75