Finding the Fourth Proportional to 2,399.56, 3,311.45 and 1,322.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,399.56 : 3,311.45 = 1,322.87 : x
2. Step 2: Convert to fraction form
   2,399.56/3,311.45 = 1,322.87/x
3. Step 3: Cross multiply
   2,399.56x = 3,311.45 × 1,322.87
4. Step 4: Simplify right side
   2,399.56x = 4,380,594.69
5. Step 5: Solve for x
   x = 4,380,594.69/2,399.56
6. Step 6: Final answer
   x = 1,825.59