Finding the Third Proportional to 16,287.75 and 21,515.63

Step by Step Solution

1. Step 1: Write the proportion equation
   16,287.75 : 21,515.63 = 21,515.63 : x
2. Step 2: Convert to fraction form
   16,287.75/21,515.63 = 21,515.63/x
3. Step 3: Cross multiply
   16,287.75x = 21,515.63 × 21,515.63
4. Step 4: Simplify right side
   16,287.75x = 462,922,119.14
5. Step 5: Solve for x
   x = 462,922,119.14/16,287.75
6. Step 6: Final answer
   x = 28,421.49