Finding the Fourth Proportional to 3,965.03, 5,471.87 and 2,196.80

Step by Step Solution

1. Step 1: Write the proportion equation
   3,965.03 : 5,471.87 = 2,196.80 : x
2. Step 2: Convert to fraction form
   3,965.03/5,471.87 = 2,196.80/x
3. Step 3: Cross multiply
   3,965.03x = 5,471.87 × 2,196.80
4. Step 4: Simplify right side
   3,965.03x = 12,020,604.02
5. Step 5: Solve for x
   x = 12,020,604.02/3,965.03
6. Step 6: Final answer
   x = 3,031.66