Finding the Fourth Proportional to 2,856.06, 4,284.30 and 1,212.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,856.06 : 4,284.30 = 1,212.42 : x
2. Step 2: Convert to fraction form
   2,856.06/4,284.30 = 1,212.42/x
3. Step 3: Cross multiply
   2,856.06x = 4,284.30 × 1,212.42
4. Step 4: Simplify right side
   2,856.06x = 5,194,371.01
5. Step 5: Solve for x
   x = 5,194,371.01/2,856.06
6. Step 6: Final answer
   x = 1,818.72