Finding the Fourth Proportional to 3,078, 4,243.59 and 2,578.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,078 : 4,243.59 = 2,578.50 : x
2. Step 2: Convert to fraction form
   3,078/4,243.59 = 2,578.50/x
3. Step 3: Cross multiply
   3,078x = 4,243.59 × 2,578.50
4. Step 4: Simplify right side
   3,078x = 10,942,096.82
5. Step 5: Solve for x
   x = 10,942,096.82/3,078
6. Step 6: Final answer
   x = 3,554.94