Finding the Fourth Proportional to 3,578.78, 4,938.88 and 2,086.46

Step by Step Solution

1. Step 1: Write the proportion equation
   3,578.78 : 4,938.88 = 2,086.46 : x
2. Step 2: Convert to fraction form
   3,578.78/4,938.88 = 2,086.46/x
3. Step 3: Cross multiply
   3,578.78x = 4,938.88 × 2,086.46
4. Step 4: Simplify right side
   3,578.78x = 10,304,775.56
5. Step 5: Solve for x
   x = 10,304,775.56/3,578.78
6. Step 6: Final answer
   x = 2,879.41