Finding the Fourth Proportional to 3,865.05, 5,786.24 and 2,399.76

Step by Step Solution

1. Step 1: Write the proportion equation
   3,865.05 : 5,786.24 = 2,399.76 : x
2. Step 2: Convert to fraction form
   3,865.05/5,786.24 = 2,399.76/x
3. Step 3: Cross multiply
   3,865.05x = 5,786.24 × 2,399.76
4. Step 4: Simplify right side
   3,865.05x = 13,885,575.30
5. Step 5: Solve for x
   x = 13,885,575.30/3,865.05
6. Step 6: Final answer
   x = 3,592.60