Finding the Fourth Proportional to 2,825.64, 4,238.37 and 851.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,825.64 : 4,238.37 = 851.28 : x
2. Step 2: Convert to fraction form
   2,825.64/4,238.37 = 851.28/x
3. Step 3: Cross multiply
   2,825.64x = 4,238.37 × 851.28
4. Step 4: Simplify right side
   2,825.64x = 3,608,039.61
5. Step 5: Solve for x
   x = 3,608,039.61/2,825.64
6. Step 6: Final answer
   x = 1,276.89