Finding the Fourth Proportional to 3,965.21, 5,471.60 and 2,196.77

Step by Step Solution

1. Step 1: Write the proportion equation
   3,965.21 : 5,471.60 = 2,196.77 : x
2. Step 2: Convert to fraction form
   3,965.21/5,471.60 = 2,196.77/x
3. Step 3: Cross multiply
   3,965.21x = 5,471.60 × 2,196.77
4. Step 4: Simplify right side
   3,965.21x = 12,019,865.90
5. Step 5: Solve for x
   x = 12,019,865.90/3,965.21
6. Step 6: Final answer
   x = 3,031.34