Finding the Fourth Proportional to 2,555.07, 3,833.31 and 911.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,555.07 : 3,833.31 = 911.78 : x
2. Step 2: Convert to fraction form
   2,555.07/3,833.31 = 911.78/x
3. Step 3: Cross multiply
   2,555.07x = 3,833.31 × 911.78
4. Step 4: Simplify right side
   2,555.07x = 3,495,116.23
5. Step 5: Solve for x
   x = 3,495,116.23/2,555.07
6. Step 6: Final answer
   x = 1,367.91