Finding the Fourth Proportional to 3,996.89, 5,515.73 and 2,228.61

Step by Step Solution

1. Step 1: Write the proportion equation
   3,996.89 : 5,515.73 = 2,228.61 : x
2. Step 2: Convert to fraction form
   3,996.89/5,515.73 = 2,228.61/x
3. Step 3: Cross multiply
   3,996.89x = 5,515.73 × 2,228.61
4. Step 4: Simplify right side
   3,996.89x = 12,292,411.04
5. Step 5: Solve for x
   x = 12,292,411.04/3,996.89
6. Step 6: Final answer
   x = 3,075.49