Finding the Fourth Proportional to 1,081.24, 1,491.59 and 1,039.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.24 : 1,491.59 = 1,039.32 : x
2. Step 2: Convert to fraction form
   1,081.24/1,491.59 = 1,039.32/x
3. Step 3: Cross multiply
   1,081.24x = 1,491.59 × 1,039.32
4. Step 4: Simplify right side
   1,081.24x = 1,550,239.32
5. Step 5: Solve for x
   x = 1,550,239.32/1,081.24
6. Step 6: Final answer
   x = 1,433.76