Finding the Fourth Proportional to 2,609.91, 3,601.71 and 1,431.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,609.91 : 3,601.71 = 1,431.09 : x
2. Step 2: Convert to fraction form
   2,609.91/3,601.71 = 1,431.09/x
3. Step 3: Cross multiply
   2,609.91x = 3,601.71 × 1,431.09
4. Step 4: Simplify right side
   2,609.91x = 5,154,371.16
5. Step 5: Solve for x
   x = 5,154,371.16/2,609.91
6. Step 6: Final answer
   x = 1,974.92