Finding the Fourth Proportional to 3,996.78, 5,515.50 and 2,228.38

Step by Step Solution

1. Step 1: Write the proportion equation
   3,996.78 : 5,515.50 = 2,228.38 : x
2. Step 2: Convert to fraction form
   3,996.78/5,515.50 = 2,228.38/x
3. Step 3: Cross multiply
   3,996.78x = 5,515.50 × 2,228.38
4. Step 4: Simplify right side
   3,996.78x = 12,290,629.89
5. Step 5: Solve for x
   x = 12,290,629.89/3,996.78
6. Step 6: Final answer
   x = 3,075.13