Finding the Fourth Proportional to 2,856.15, 4,284.90 and 1,212.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,856.15 : 4,284.90 = 1,212.78 : x
2. Step 2: Convert to fraction form
   2,856.15/4,284.90 = 1,212.78/x
3. Step 3: Cross multiply
   2,856.15x = 4,284.90 × 1,212.78
4. Step 4: Simplify right side
   2,856.15x = 5,196,641.02
5. Step 5: Solve for x
   x = 5,196,641.02/2,856.15
6. Step 6: Final answer
   x = 1,819.46