Finding the Fourth Proportional to 1,055.83, 1,584.31 and 439.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,055.83 : 1,584.31 = 439.96 : x
2. Step 2: Convert to fraction form
   1,055.83/1,584.31 = 439.96/x
3. Step 3: Cross multiply
   1,055.83x = 1,584.31 × 439.96
4. Step 4: Simplify right side
   1,055.83x = 697,033.03
5. Step 5: Solve for x
   x = 697,033.03/1,055.83
6. Step 6: Final answer
   x = 660.18