Finding the Fourth Proportional to 2,855.67, 4,284.72 and 1,212.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,855.67 : 4,284.72 = 1,212.57 : x
2. Step 2: Convert to fraction form
   2,855.67/4,284.72 = 1,212.57/x
3. Step 3: Cross multiply
   2,855.67x = 4,284.72 × 1,212.57
4. Step 4: Simplify right side
   2,855.67x = 5,195,522.93
5. Step 5: Solve for x
   x = 5,195,522.93/2,855.67
6. Step 6: Final answer
   x = 1,819.37