Finding the Fourth Proportional to 2,556.07, 3,834.81 and 912.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,556.07 : 3,834.81 = 912.78 : x
2. Step 2: Convert to fraction form
   2,556.07/3,834.81 = 912.78/x
3. Step 3: Cross multiply
   2,556.07x = 3,834.81 × 912.78
4. Step 4: Simplify right side
   2,556.07x = 3,500,337.87
5. Step 5: Solve for x
   x = 3,500,337.87/2,556.07
6. Step 6: Final answer
   x = 1,369.42