Finding the Fourth Proportional to 2,578.66, 3,868.71 and 848.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,578.66 : 3,868.71 = 848.50 : x
2. Step 2: Convert to fraction form
   2,578.66/3,868.71 = 848.50/x
3. Step 3: Cross multiply
   2,578.66x = 3,868.71 × 848.50
4. Step 4: Simplify right side
   2,578.66x = 3,282,600.44
5. Step 5: Solve for x
   x = 3,282,600.44/2,578.66
6. Step 6: Final answer
   x = 1,272.99