Finding the Fourth Proportional to 3,831.72, 5,286.42 and 2,175.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,831.72 : 5,286.42 = 2,175.72 : x
2. Step 2: Convert to fraction form
   3,831.72/5,286.42 = 2,175.72/x
3. Step 3: Cross multiply
   3,831.72x = 5,286.42 × 2,175.72
4. Step 4: Simplify right side
   3,831.72x = 11,501,769.72
5. Step 5: Solve for x
   x = 11,501,769.72/3,831.72
6. Step 6: Final answer
   x = 3,001.73