Finding the Fourth Proportional to 2,556.42, 3,835.25 and 890.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,556.42 : 3,835.25 = 890.31 : x
2. Step 2: Convert to fraction form
   2,556.42/3,835.25 = 890.31/x
3. Step 3: Cross multiply
   2,556.42x = 3,835.25 × 890.31
4. Step 4: Simplify right side
   2,556.42x = 3,414,561.43
5. Step 5: Solve for x
   x = 3,414,561.43/2,556.42
6. Step 6: Final answer
   x = 1,335.68