Finding the Fourth Proportional to 5,172.57, 7,138.17 and 2,814.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,172.57 : 7,138.17 = 2,814.72 : x
2. Step 2: Convert to fraction form
   5,172.57/7,138.17 = 2,814.72/x
3. Step 3: Cross multiply
   5,172.57x = 7,138.17 × 2,814.72
4. Step 4: Simplify right side
   5,172.57x = 20,091,949.86
5. Step 5: Solve for x
   x = 20,091,949.86/5,172.57
6. Step 6: Final answer
   x = 3,884.33