Finding the Fourth Proportional to 2,105.30, 3,158.66 and 1,324.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.30 : 3,158.66 = 1,324.40 : x
2. Step 2: Convert to fraction form
   2,105.30/3,158.66 = 1,324.40/x
3. Step 3: Cross multiply
   2,105.30x = 3,158.66 × 1,324.40
4. Step 4: Simplify right side
   2,105.30x = 4,183,316.82
5. Step 5: Solve for x
   x = 4,183,316.82/2,105.30
6. Step 6: Final answer
   x = 1,987.04