Finding the Fourth Proportional to 2,291.72, 3,162.58 and 1,243.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,291.72 : 3,162.58 = 1,243.78 : x
2. Step 2: Convert to fraction form
   2,291.72/3,162.58 = 1,243.78/x
3. Step 3: Cross multiply
   2,291.72x = 3,162.58 × 1,243.78
4. Step 4: Simplify right side
   2,291.72x = 3,933,553.75
5. Step 5: Solve for x
   x = 3,933,553.75/2,291.72
6. Step 6: Final answer
   x = 1,716.42