Finding the Fourth Proportional to 2,661.05, 3,991.56 and 1,198.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661.05 : 3,991.56 = 1,198.49 : x
2. Step 2: Convert to fraction form
   2,661.05/3,991.56 = 1,198.49/x
3. Step 3: Cross multiply
   2,661.05x = 3,991.56 × 1,198.49
4. Step 4: Simplify right side
   2,661.05x = 4,783,824.79
5. Step 5: Solve for x
   x = 4,783,824.79/2,661.05
6. Step 6: Final answer
   x = 1,797.72