Finding the Fourth Proportional to 2,555.40, 3,833.98 and 1,321.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,555.40 : 3,833.98 = 1,321.56 : x
2. Step 2: Convert to fraction form
   2,555.40/3,833.98 = 1,321.56/x
3. Step 3: Cross multiply
   2,555.40x = 3,833.98 × 1,321.56
4. Step 4: Simplify right side
   2,555.40x = 5,066,834.61
5. Step 5: Solve for x
   x = 5,066,834.61/2,555.40
6. Step 6: Final answer
   x = 1,982.80