Finding the Fourth Proportional to 2,859.68, 4,288.38 and 1,216.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,859.68 : 4,288.38 = 1,216.28 : x
2. Step 2: Convert to fraction form
   2,859.68/4,288.38 = 1,216.28/x
3. Step 3: Cross multiply
   2,859.68x = 4,288.38 × 1,216.28
4. Step 4: Simplify right side
   2,859.68x = 5,215,849.38
5. Step 5: Solve for x
   x = 5,215,849.38/2,859.68
6. Step 6: Final answer
   x = 1,823.93