Finding the Fourth Proportional to 2,339.74, 3,228.78 and 1,291.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,339.74 : 3,228.78 = 1,291.78 : x
2. Step 2: Convert to fraction form
   2,339.74/3,228.78 = 1,291.78/x
3. Step 3: Cross multiply
   2,339.74x = 3,228.78 × 1,291.78
4. Step 4: Simplify right side
   2,339.74x = 4,170,873.43
5. Step 5: Solve for x
   x = 4,170,873.43/2,339.74
6. Step 6: Final answer
   x = 1,782.62