Finding the Fourth Proportional to 2,286.78, 3,155.74 and 1,238.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,286.78 : 3,155.74 = 1,238.84 : x
2. Step 2: Convert to fraction form
   2,286.78/3,155.74 = 1,238.84/x
3. Step 3: Cross multiply
   2,286.78x = 3,155.74 × 1,238.84
4. Step 4: Simplify right side
   2,286.78x = 3,909,456.94
5. Step 5: Solve for x
   x = 3,909,456.94/2,286.78
6. Step 6: Final answer
   x = 1,709.59