Finding the Fourth Proportional to 3,965.12, 5,471.78 and 2,196.62

Step by Step Solution

1. Step 1: Write the proportion equation
   3,965.12 : 5,471.78 = 2,196.62 : x
2. Step 2: Convert to fraction form
   3,965.12/5,471.78 = 2,196.62/x
3. Step 3: Cross multiply
   3,965.12x = 5,471.78 × 2,196.62
4. Step 4: Simplify right side
   3,965.12x = 12,019,383.04
5. Step 5: Solve for x
   x = 12,019,383.04/3,965.12
6. Step 6: Final answer
   x = 3,031.28