Finding the Fourth Proportional to 3,997.15, 5,515.90 and 2,228.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,997.15 : 5,515.90 = 2,228.72 : x
2. Step 2: Convert to fraction form
   3,997.15/5,515.90 = 2,228.72/x
3. Step 3: Cross multiply
   3,997.15x = 5,515.90 × 2,228.72
4. Step 4: Simplify right side
   3,997.15x = 12,293,363.50
5. Step 5: Solve for x
   x = 12,293,363.50/3,997.15
6. Step 6: Final answer
   x = 3,075.53