Finding the Third Proportional to 13,680 and 16,488

Step by Step Solution

1. Step 1: Write the proportion equation
   13,680 : 16,488 = 16,488 : x
2. Step 2: Convert to fraction form
   13,680/16,488 = 16,488/x
3. Step 3: Cross multiply
   13,680x = 16,488 × 16,488
4. Step 4: Simplify right side
   13,680x = 271,854,144
5. Step 5: Solve for x
   x = 271,854,144/13,680
6. Step 6: Final answer
   x = 19,872.38