Finding the Fourth Proportional to 2,399.31, 3,599.07 and 1,099.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,399.31 : 3,599.07 = 1,099.89 : x
2. Step 2: Convert to fraction form
   2,399.31/3,599.07 = 1,099.89/x
3. Step 3: Cross multiply
   2,399.31x = 3,599.07 × 1,099.89
4. Step 4: Simplify right side
   2,399.31x = 3,958,581.10
5. Step 5: Solve for x
   x = 3,958,581.10/2,399.31
6. Step 6: Final answer
   x = 1,649.88