Finding the Fourth Proportional to 2,663.69, 3,989.37 and 2,571.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,663.69 : 3,989.37 = 2,571.42 : x
2. Step 2: Convert to fraction form
   2,663.69/3,989.37 = 2,571.42/x
3. Step 3: Cross multiply
   2,663.69x = 3,989.37 × 2,571.42
4. Step 4: Simplify right side
   2,663.69x = 10,258,345.81
5. Step 5: Solve for x
   x = 10,258,345.81/2,663.69
6. Step 6: Final answer
   x = 3,851.18