Finding the Fourth Proportional to 12,647.72, 18,965.10 and 8,021

Step by Step Solution

1. Step 1: Write the proportion equation
   12,647.72 : 18,965.10 = 8,021 : x
2. Step 2: Convert to fraction form
   12,647.72/18,965.10 = 8,021/x
3. Step 3: Cross multiply
   12,647.72x = 18,965.10 × 8,021
4. Step 4: Simplify right side
   12,647.72x = 152,119,067.10
5. Step 5: Solve for x
   x = 152,119,067.10/12,647.72
6. Step 6: Final answer
   x = 12,027.39