Finding the Fourth Proportional to 2,556.55, 3,835.40 and 913.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,556.55 : 3,835.40 = 913.09 : x
2. Step 2: Convert to fraction form
   2,556.55/3,835.40 = 913.09/x
3. Step 3: Cross multiply
   2,556.55x = 3,835.40 × 913.09
4. Step 4: Simplify right side
   2,556.55x = 3,502,065.39
5. Step 5: Solve for x
   x = 3,502,065.39/2,556.55
6. Step 6: Final answer
   x = 1,369.84