Finding the Fourth Proportional to 2,857.83, 4,288.37 and 1,214.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,857.83 : 4,288.37 = 1,214.21 : x
2. Step 2: Convert to fraction form
   2,857.83/4,288.37 = 1,214.21/x
3. Step 3: Cross multiply
   2,857.83x = 4,288.37 × 1,214.21
4. Step 4: Simplify right side
   2,857.83x = 5,206,954.22
5. Step 5: Solve for x
   x = 5,206,954.22/2,857.83
6. Step 6: Final answer
   x = 1,822.00