Finding the Fourth Proportional to 3,851.61, 5,315.25 and 2,150.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,851.61 : 5,315.25 = 2,150.20 : x
2. Step 2: Convert to fraction form
   3,851.61/5,315.25 = 2,150.20/x
3. Step 3: Cross multiply
   3,851.61x = 5,315.25 × 2,150.20
4. Step 4: Simplify right side
   3,851.61x = 11,428,831.89
5. Step 5: Solve for x
   x = 11,428,831.89/3,851.61
6. Step 6: Final answer
   x = 2,967.28