Finding the Fourth Proportional to 2,556.90, 3,834.81 and 913.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,556.90 : 3,834.81 = 913.55 : x
2. Step 2: Convert to fraction form
   2,556.90/3,834.81 = 913.55/x
3. Step 3: Cross multiply
   2,556.90x = 3,834.81 × 913.55
4. Step 4: Simplify right side
   2,556.90x = 3,503,271.50
5. Step 5: Solve for x
   x = 3,503,271.50/2,556.90
6. Step 6: Final answer
   x = 1,370.12