Finding the Fourth Proportional to 3,965.21, 5,471.73 and 2,196.98

Step by Step Solution

1. Step 1: Write the proportion equation
   3,965.21 : 5,471.73 = 2,196.98 : x
2. Step 2: Convert to fraction form
   3,965.21/5,471.73 = 2,196.98/x
3. Step 3: Cross multiply
   3,965.21x = 5,471.73 × 2,196.98
4. Step 4: Simplify right side
   3,965.21x = 12,021,281.38
5. Step 5: Solve for x
   x = 12,021,281.38/3,965.21
6. Step 6: Final answer
   x = 3,031.69