Finding the Fourth Proportional to 3,578.93, 4,939.39 and 2,087.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,578.93 : 4,939.39 = 2,087.31 : x
2. Step 2: Convert to fraction form
   3,578.93/4,939.39 = 2,087.31/x
3. Step 3: Cross multiply
   3,578.93x = 4,939.39 × 2,087.31
4. Step 4: Simplify right side
   3,578.93x = 10,310,038.14
5. Step 5: Solve for x
   x = 10,310,038.14/3,578.93
6. Step 6: Final answer
   x = 2,880.76