Finding the Fourth Proportional to 3,609.12, 5,387.52 and 3,171.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,609.12 : 5,387.52 = 3,171.72 : x
2. Step 2: Convert to fraction form
   3,609.12/5,387.52 = 3,171.72/x
3. Step 3: Cross multiply
   3,609.12x = 5,387.52 × 3,171.72
4. Step 4: Simplify right side
   3,609.12x = 17,087,704.93
5. Step 5: Solve for x
   x = 17,087,704.93/3,609.12
6. Step 6: Final answer
   x = 4,734.59