Finding the Fourth Proportional to 3,447.61, 5,171.42 and 1,107.86

Step by Step Solution

1. Step 1: Write the proportion equation
   3,447.61 : 5,171.42 = 1,107.86 : x
2. Step 2: Convert to fraction form
   3,447.61/5,171.42 = 1,107.86/x
3. Step 3: Cross multiply
   3,447.61x = 5,171.42 × 1,107.86
4. Step 4: Simplify right side
   3,447.61x = 5,729,186.27
5. Step 5: Solve for x
   x = 5,729,186.27/3,447.61
6. Step 6: Final answer
   x = 1,661.79