Finding the Third Proportional to 16,560 and 18,840

Step by Step Solution

1. Step 1: Write the proportion equation
   16,560 : 18,840 = 18,840 : x
2. Step 2: Convert to fraction form
   16,560/18,840 = 18,840/x
3. Step 3: Cross multiply
   16,560x = 18,840 × 18,840
4. Step 4: Simplify right side
   16,560x = 354,945,600
5. Step 5: Solve for x
   x = 354,945,600/16,560
6. Step 6: Final answer
   x = 21,433.91