Finding the Fourth Proportional to 3,965.49, 5,471.91 and 2,196.64

Step by Step Solution

1. Step 1: Write the proportion equation
   3,965.49 : 5,471.91 = 2,196.64 : x
2. Step 2: Convert to fraction form
   3,965.49/5,471.91 = 2,196.64/x
3. Step 3: Cross multiply
   3,965.49x = 5,471.91 × 2,196.64
4. Step 4: Simplify right side
   3,965.49x = 12,019,816.38
5. Step 5: Solve for x
   x = 12,019,816.38/3,965.49
6. Step 6: Final answer
   x = 3,031.10