Finding the Fourth Proportional to 3,996.78, 5,515.83 and 2,228.37

Step by Step Solution

1. Step 1: Write the proportion equation
   3,996.78 : 5,515.83 = 2,228.37 : x
2. Step 2: Convert to fraction form
   3,996.78/5,515.83 = 2,228.37/x
3. Step 3: Cross multiply
   3,996.78x = 5,515.83 × 2,228.37
4. Step 4: Simplify right side
   3,996.78x = 12,291,310.10
5. Step 5: Solve for x
   x = 12,291,310.10/3,996.78
6. Step 6: Final answer
   x = 3,075.30