Finding the Fourth Proportional to 1,078.83, 1,485.81 and 931.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.83 : 1,485.81 = 931.41 : x
2. Step 2: Convert to fraction form
   1,078.83/1,485.81 = 931.41/x
3. Step 3: Cross multiply
   1,078.83x = 1,485.81 × 931.41
4. Step 4: Simplify right side
   1,078.83x = 1,383,898.29
5. Step 5: Solve for x
   x = 1,383,898.29/1,078.83
6. Step 6: Final answer
   x = 1,282.78