Finding the Fourth Proportional to 12,686.72, 18,982.56 and 12,020

Step by Step Solution

1. Step 1: Write the proportion equation
   12,686.72 : 18,982.56 = 12,020 : x
2. Step 2: Convert to fraction form
   12,686.72/18,982.56 = 12,020/x
3. Step 3: Cross multiply
   12,686.72x = 18,982.56 × 12,020
4. Step 4: Simplify right side
   12,686.72x = 228,170,371.20
5. Step 5: Solve for x
   x = 228,170,371.20/12,686.72
6. Step 6: Final answer
   x = 17,984.98