Finding the Third Proportional to 8,487 and 13,198.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,487 : 13,198.50 = 13,198.50 : x
2. Step 2: Convert to fraction form
   8,487/13,198.50 = 13,198.50/x
3. Step 3: Cross multiply
   8,487x = 13,198.50 × 13,198.50
4. Step 4: Simplify right side
   8,487x = 174,200,402.25
5. Step 5: Solve for x
   x = 174,200,402.25/8,487
6. Step 6: Final answer
   x = 20,525.56