Finding the Third Proportional to 21,144 and 28,479

Step by Step Solution

1. Step 1: Write the proportion equation
   21,144 : 28,479 = 28,479 : x
2. Step 2: Convert to fraction form
   21,144/28,479 = 28,479/x
3. Step 3: Cross multiply
   21,144x = 28,479 × 28,479
4. Step 4: Simplify right side
   21,144x = 811,053,441
5. Step 5: Solve for x
   x = 811,053,441/21,144
6. Step 6: Final answer
   x = 38,358.56