Finding the Fourth Proportional to 2,578.32, 3,867 and 846.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,578.32 : 3,867 = 846.72 : x
2. Step 2: Convert to fraction form
   2,578.32/3,867 = 846.72/x
3. Step 3: Cross multiply
   2,578.32x = 3,867 × 846.72
4. Step 4: Simplify right side
   2,578.32x = 3,274,266.24
5. Step 5: Solve for x
   x = 3,274,266.24/2,578.32
6. Step 6: Final answer
   x = 1,269.92