Finding the Fourth Proportional to 2,861.33, 4,293.20 and 1,218.65

Step by Step Solution

1. Step 1: Write the proportion equation
   2,861.33 : 4,293.20 = 1,218.65 : x
2. Step 2: Convert to fraction form
   2,861.33/4,293.20 = 1,218.65/x
3. Step 3: Cross multiply
   2,861.33x = 4,293.20 × 1,218.65
4. Step 4: Simplify right side
   2,861.33x = 5,231,889.76
5. Step 5: Solve for x
   x = 5,231,889.76/2,861.33
6. Step 6: Final answer
   x = 1,828.48