Finding the Fourth Proportional to 2,857.55, 4,284.30 and 1,298.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,857.55 : 4,284.30 = 1,298.30 : x
2. Step 2: Convert to fraction form
   2,857.55/4,284.30 = 1,298.30/x
3. Step 3: Cross multiply
   2,857.55x = 4,284.30 × 1,298.30
4. Step 4: Simplify right side
   2,857.55x = 5,562,306.69
5. Step 5: Solve for x
   x = 5,562,306.69/2,857.55
6. Step 6: Final answer
   x = 1,946.53