Finding the Fourth Proportional to 2,858.10, 4,283.30 and 1,214.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,858.10 : 4,283.30 = 1,214.21 : x
2. Step 2: Convert to fraction form
   2,858.10/4,283.30 = 1,214.21/x
3. Step 3: Cross multiply
   2,858.10x = 4,283.30 × 1,214.21
4. Step 4: Simplify right side
   2,858.10x = 5,200,825.69
5. Step 5: Solve for x
   x = 5,200,825.69/2,858.10
6. Step 6: Final answer
   x = 1,819.68