Finding the Fourth Proportional to 3,571.11, 5,356.89 and 1,105.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,571.11 : 5,356.89 = 1,105.72 : x
2. Step 2: Convert to fraction form
   3,571.11/5,356.89 = 1,105.72/x
3. Step 3: Cross multiply
   3,571.11x = 5,356.89 × 1,105.72
4. Step 4: Simplify right side
   3,571.11x = 5,923,188.10
5. Step 5: Solve for x
   x = 5,923,188.10/3,571.11
6. Step 6: Final answer
   x = 1,658.64