Finding the Fourth Proportional to 2,809.57, 4,215.14 and 1,228.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,809.57 : 4,215.14 = 1,228.43 : x
2. Step 2: Convert to fraction form
   2,809.57/4,215.14 = 1,228.43/x
3. Step 3: Cross multiply
   2,809.57x = 4,215.14 × 1,228.43
4. Step 4: Simplify right side
   2,809.57x = 5,178,004.43
5. Step 5: Solve for x
   x = 5,178,004.43/2,809.57
6. Step 6: Final answer
   x = 1,842.99