Finding the Fourth Proportional to 2,399.45, 3,311.78 and 1,558.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,399.45 : 3,311.78 = 1,558.68 : x
2. Step 2: Convert to fraction form
   2,399.45/3,311.78 = 1,558.68/x
3. Step 3: Cross multiply
   2,399.45x = 3,311.78 × 1,558.68
4. Step 4: Simplify right side
   2,399.45x = 5,162,015.72
5. Step 5: Solve for x
   x = 5,162,015.72/2,399.45
6. Step 6: Final answer
   x = 2,151.34