Finding the Fourth Proportional to 2,511.72, 3,766.59 and 867.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,511.72 : 3,766.59 = 867.78 : x
2. Step 2: Convert to fraction form
   2,511.72/3,766.59 = 867.78/x
3. Step 3: Cross multiply
   2,511.72x = 3,766.59 × 867.78
4. Step 4: Simplify right side
   2,511.72x = 3,268,571.47
5. Step 5: Solve for x
   x = 3,268,571.47/2,511.72
6. Step 6: Final answer
   x = 1,301.33