Finding the Fourth Proportional to 1,328.89, 1,833.77 and 831.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,328.89 : 1,833.77 = 831.50 : x
2. Step 2: Convert to fraction form
   1,328.89/1,833.77 = 831.50/x
3. Step 3: Cross multiply
   1,328.89x = 1,833.77 × 831.50
4. Step 4: Simplify right side
   1,328.89x = 1,524,779.76
5. Step 5: Solve for x
   x = 1,524,779.76/1,328.89
6. Step 6: Final answer
   x = 1,147.41