Finding the Fourth Proportional to 3,965.16, 5,472.09 and 2,196.75

Step by Step Solution

1. Step 1: Write the proportion equation
   3,965.16 : 5,472.09 = 2,196.75 : x
2. Step 2: Convert to fraction form
   3,965.16/5,472.09 = 2,196.75/x
3. Step 3: Cross multiply
   3,965.16x = 5,472.09 × 2,196.75
4. Step 4: Simplify right side
   3,965.16x = 12,020,813.71
5. Step 5: Solve for x
   x = 12,020,813.71/3,965.16
6. Step 6: Final answer
   x = 3,031.61