Finding the Fourth Proportional to 3,965.10, 5,471.82 and 2,196.60

Step by Step Solution

1. Step 1: Write the proportion equation
   3,965.10 : 5,471.82 = 2,196.60 : x
2. Step 2: Convert to fraction form
   3,965.10/5,471.82 = 2,196.60/x
3. Step 3: Cross multiply
   3,965.10x = 5,471.82 × 2,196.60
4. Step 4: Simplify right side
   3,965.10x = 12,019,399.81
5. Step 5: Solve for x
   x = 12,019,399.81/3,965.10
6. Step 6: Final answer
   x = 3,031.30