Finding the Fourth Proportional to 3,870.12, 5,339.46 and 3,171.24

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.12 : 5,339.46 = 3,171.24 : x
2. Step 2: Convert to fraction form
   3,870.12/5,339.46 = 3,171.24/x
3. Step 3: Cross multiply
   3,870.12x = 5,339.46 × 3,171.24
4. Step 4: Simplify right side
   3,870.12x = 16,932,709.13
5. Step 5: Solve for x
   x = 16,932,709.13/3,870.12
6. Step 6: Final answer
   x = 4,375.24