Finding the Fourth Proportional to 2,286.74, 3,155.69 and 1,238.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,286.74 : 3,155.69 = 1,238.80 : x
2. Step 2: Convert to fraction form
   2,286.74/3,155.69 = 1,238.80/x
3. Step 3: Cross multiply
   2,286.74x = 3,155.69 × 1,238.80
4. Step 4: Simplify right side
   2,286.74x = 3,909,268.77
5. Step 5: Solve for x
   x = 3,909,268.77/2,286.74
6. Step 6: Final answer
   x = 1,709.54