Finding the Fourth Proportional to 2,289.72, 3,159.81 and 1,241.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,289.72 : 3,159.81 = 1,241.78 : x
2. Step 2: Convert to fraction form
   2,289.72/3,159.81 = 1,241.78/x
3. Step 3: Cross multiply
   2,289.72x = 3,159.81 × 1,241.78
4. Step 4: Simplify right side
   2,289.72x = 3,923,788.86
5. Step 5: Solve for x
   x = 3,923,788.86/2,289.72
6. Step 6: Final answer
   x = 1,713.65