Finding the Fourth Proportional to 2,578.72, 3,868.32 and 847.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,578.72 : 3,868.32 = 847.52 : x
2. Step 2: Convert to fraction form
   2,578.72/3,868.32 = 847.52/x
3. Step 3: Cross multiply
   2,578.72x = 3,868.32 × 847.52
4. Step 4: Simplify right side
   2,578.72x = 3,278,478.57
5. Step 5: Solve for x
   x = 3,278,478.57/2,578.72
6. Step 6: Final answer
   x = 1,271.36