Finding the Fourth Proportional to 2,399.82, 3,309.27 and 1,690.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,399.82 : 3,309.27 = 1,690.38 : x
2. Step 2: Convert to fraction form
   2,399.82/3,309.27 = 1,690.38/x
3. Step 3: Cross multiply
   2,399.82x = 3,309.27 × 1,690.38
4. Step 4: Simplify right side
   2,399.82x = 5,593,923.82
5. Step 5: Solve for x
   x = 5,593,923.82/2,399.82
6. Step 6: Final answer
   x = 2,330.98