Finding the Third Proportional to 21,108 and 28,416

Step by Step Solution

1. Step 1: Write the proportion equation
   21,108 : 28,416 = 28,416 : x
2. Step 2: Convert to fraction form
   21,108/28,416 = 28,416/x
3. Step 3: Cross multiply
   21,108x = 28,416 × 28,416
4. Step 4: Simplify right side
   21,108x = 807,469,056
5. Step 5: Solve for x
   x = 807,469,056/21,108
6. Step 6: Final answer
   x = 38,254.17