Finding the Third Proportional to 16,147.69 and 21,520.69

Step by Step Solution

1. Step 1: Write the proportion equation
   16,147.69 : 21,520.69 = 21,520.69 : x
2. Step 2: Convert to fraction form
   16,147.69/21,520.69 = 21,520.69/x
3. Step 3: Cross multiply
   16,147.69x = 21,520.69 × 21,520.69
4. Step 4: Simplify right side
   16,147.69x = 463,139,990.47
5. Step 5: Solve for x
   x = 463,139,990.47/16,147.69
6. Step 6: Final answer
   x = 28,681.51