Finding the Fourth Proportional to 2,291.78, 3,162.66 and 1,243.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,291.78 : 3,162.66 = 1,243.84 : x
2. Step 2: Convert to fraction form
   2,291.78/3,162.66 = 1,243.84/x
3. Step 3: Cross multiply
   2,291.78x = 3,162.66 × 1,243.84
4. Step 4: Simplify right side
   2,291.78x = 3,933,843.01
5. Step 5: Solve for x
   x = 3,933,843.01/2,291.78
6. Step 6: Final answer
   x = 1,716.50