Finding the Fourth Proportional to 1,081.10, 1,617.71 and 936.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.10 : 1,617.71 = 936.53 : x
2. Step 2: Convert to fraction form
   1,081.10/1,617.71 = 936.53/x
3. Step 3: Cross multiply
   1,081.10x = 1,617.71 × 936.53
4. Step 4: Simplify right side
   1,081.10x = 1,515,033.31
5. Step 5: Solve for x
   x = 1,515,033.31/1,081.10
6. Step 6: Final answer
   x = 1,401.39