Finding the Fourth Proportional to 2,556.50, 3,833.46 and 912.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,556.50 : 3,833.46 = 912.78 : x
2. Step 2: Convert to fraction form
   2,556.50/3,833.46 = 912.78/x
3. Step 3: Cross multiply
   2,556.50x = 3,833.46 × 912.78
4. Step 4: Simplify right side
   2,556.50x = 3,499,105.62
5. Step 5: Solve for x
   x = 3,499,105.62/2,556.50
6. Step 6: Final answer
   x = 1,368.71