Finding the Fourth Proportional to 2,286.91, 3,155.96 and 1,238.99

Step by Step Solution

1. Step 1: Write the proportion equation
   2,286.91 : 3,155.96 = 1,238.99 : x
2. Step 2: Convert to fraction form
   2,286.91/3,155.96 = 1,238.99/x
3. Step 3: Cross multiply
   2,286.91x = 3,155.96 × 1,238.99
4. Step 4: Simplify right side
   2,286.91x = 3,910,196.69
5. Step 5: Solve for x
   x = 3,910,196.69/2,286.91
6. Step 6: Final answer
   x = 1,709.82