Finding the Fourth Proportional to 1,890.83, 2,831.37 and 1,239.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,890.83 : 2,831.37 = 1,239.59 : x
2. Step 2: Convert to fraction form
   1,890.83/2,831.37 = 1,239.59/x
3. Step 3: Cross multiply
   1,890.83x = 2,831.37 × 1,239.59
4. Step 4: Simplify right side
   1,890.83x = 3,509,723.78
5. Step 5: Solve for x
   x = 3,509,723.78/1,890.83
6. Step 6: Final answer
   x = 1,856.19