Finding the Fourth Proportional to 2,578.88, 3,866.72 and 847.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,578.88 : 3,866.72 = 847.04 : x
2. Step 2: Convert to fraction form
   2,578.88/3,866.72 = 847.04/x
3. Step 3: Cross multiply
   2,578.88x = 3,866.72 × 847.04
4. Step 4: Simplify right side
   2,578.88x = 3,275,266.51
5. Step 5: Solve for x
   x = 3,275,266.51/2,578.88
6. Step 6: Final answer
   x = 1,270.03