Finding the Fourth Proportional to 2,609.69, 3,904.71 and 1,831.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,609.69 : 3,904.71 = 1,831.20 : x
2. Step 2: Convert to fraction form
   2,609.69/3,904.71 = 1,831.20/x
3. Step 3: Cross multiply
   2,609.69x = 3,904.71 × 1,831.20
4. Step 4: Simplify right side
   2,609.69x = 7,150,331.84
5. Step 5: Solve for x
   x = 7,150,331.84/2,609.69
6. Step 6: Final answer
   x = 2,739.92