Finding the Fourth Proportional to 2,860.57, 4,291.78 and 1,218.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,860.57 : 4,291.78 = 1,218.50 : x
2. Step 2: Convert to fraction form
   2,860.57/4,291.78 = 1,218.50/x
3. Step 3: Cross multiply
   2,860.57x = 4,291.78 × 1,218.50
4. Step 4: Simplify right side
   2,860.57x = 5,229,533.93
5. Step 5: Solve for x
   x = 5,229,533.93/2,860.57
6. Step 6: Final answer
   x = 1,828.14