Finding the Fourth Proportional to 3,964.72, 5,471.40 and 2,196.40

Step by Step Solution

1. Step 1: Write the proportion equation
   3,964.72 : 5,471.40 = 2,196.40 : x
2. Step 2: Convert to fraction form
   3,964.72/5,471.40 = 2,196.40/x
3. Step 3: Cross multiply
   3,964.72x = 5,471.40 × 2,196.40
4. Step 4: Simplify right side
   3,964.72x = 12,017,382.96
5. Step 5: Solve for x
   x = 12,017,382.96/3,964.72
6. Step 6: Final answer
   x = 3,031.08