Finding the Fourth Proportional to 2,555.06, 3,832.91 and 911.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,555.06 : 3,832.91 = 911.78 : x
2. Step 2: Convert to fraction form
   2,555.06/3,832.91 = 911.78/x
3. Step 3: Cross multiply
   2,555.06x = 3,832.91 × 911.78
4. Step 4: Simplify right side
   2,555.06x = 3,494,766.12
5. Step 5: Solve for x
   x = 3,494,766.12/2,555.06
6. Step 6: Final answer
   x = 1,367.78