Finding the Fourth Proportional to 12,271.28, 18,401.64 and 3,948.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,271.28 : 18,401.64 = 3,948.56 : x
2. Step 2: Convert to fraction form
   12,271.28/18,401.64 = 3,948.56/x
3. Step 3: Cross multiply
   12,271.28x = 18,401.64 × 3,948.56
4. Step 4: Simplify right side
   12,271.28x = 72,659,979.64
5. Step 5: Solve for x
   x = 72,659,979.64/12,271.28
6. Step 6: Final answer
   x = 5,921.14