Finding the Fourth Proportional to 2,288.70, 3,158.31 and 1,293.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,288.70 : 3,158.31 = 1,293.90 : x
2. Step 2: Convert to fraction form
   2,288.70/3,158.31 = 1,293.90/x
3. Step 3: Cross multiply
   2,288.70x = 3,158.31 × 1,293.90
4. Step 4: Simplify right side
   2,288.70x = 4,086,537.31
5. Step 5: Solve for x
   x = 4,086,537.31/2,288.70
6. Step 6: Final answer
   x = 1,785.53