Finding the Fourth Proportional to 3,997.12, 5,519.52 and 3,866.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,997.12 : 5,519.52 = 3,866.56 : x
2. Step 2: Convert to fraction form
   3,997.12/5,519.52 = 3,866.56/x
3. Step 3: Cross multiply
   3,997.12x = 5,519.52 × 3,866.56
4. Step 4: Simplify right side
   3,997.12x = 21,341,555.25
5. Step 5: Solve for x
   x = 21,341,555.25/3,997.12
6. Step 6: Final answer
   x = 5,339.23