Finding the Fourth Proportional to 2,399.40, 3,311.06 and 1,613.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,399.40 : 3,311.06 = 1,613.32 : x
2. Step 2: Convert to fraction form
   2,399.40/3,311.06 = 1,613.32/x
3. Step 3: Cross multiply
   2,399.40x = 3,311.06 × 1,613.32
4. Step 4: Simplify right side
   2,399.40x = 5,341,799.32
5. Step 5: Solve for x
   x = 5,341,799.32/2,399.40
6. Step 6: Final answer
   x = 2,226.31