Finding the Fourth Proportional to 2,851.52, 3,945.88 and 2,431.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,851.52 : 3,945.88 = 2,431.20 : x
2. Step 2: Convert to fraction form
   2,851.52/3,945.88 = 2,431.20/x
3. Step 3: Cross multiply
   2,851.52x = 3,945.88 × 2,431.20
4. Step 4: Simplify right side
   2,851.52x = 9,593,223.46
5. Step 5: Solve for x
   x = 9,593,223.46/2,851.52
6. Step 6: Final answer
   x = 3,364.25