Finding the Fourth Proportional to 3,387.39, 5,081.91 and 1,078.89

Step by Step Solution

1. Step 1: Write the proportion equation
   3,387.39 : 5,081.91 = 1,078.89 : x
2. Step 2: Convert to fraction form
   3,387.39/5,081.91 = 1,078.89/x
3. Step 3: Cross multiply
   3,387.39x = 5,081.91 × 1,078.89
4. Step 4: Simplify right side
   3,387.39x = 5,482,821.88
5. Step 5: Solve for x
   x = 5,482,821.88/3,387.39
6. Step 6: Final answer
   x = 1,618.60