Finding the Fourth Proportional to 2,855.86, 4,284.06 and 1,212.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,855.86 : 4,284.06 = 1,212.92 : x
2. Step 2: Convert to fraction form
   2,855.86/4,284.06 = 1,212.92/x
3. Step 3: Cross multiply
   2,855.86x = 4,284.06 × 1,212.92
4. Step 4: Simplify right side
   2,855.86x = 5,196,222.06
5. Step 5: Solve for x
   x = 5,196,222.06/2,855.86
6. Step 6: Final answer
   x = 1,819.49