Finding the Fourth Proportional to 2,855.94, 4,284.54 and 1,213.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,855.94 : 4,284.54 = 1,213.89 : x
2. Step 2: Convert to fraction form
   2,855.94/4,284.54 = 1,213.89/x
3. Step 3: Cross multiply
   2,855.94x = 4,284.54 × 1,213.89
4. Step 4: Simplify right side
   2,855.94x = 5,200,946.51
5. Step 5: Solve for x
   x = 5,200,946.51/2,855.94
6. Step 6: Final answer
   x = 1,821.10