Finding the Fourth Proportional to 2,086.78, 2,879.73 and 1,142.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.78 : 2,879.73 = 1,142.55 : x
2. Step 2: Convert to fraction form
   2,086.78/2,879.73 = 1,142.55/x
3. Step 3: Cross multiply
   2,086.78x = 2,879.73 × 1,142.55
4. Step 4: Simplify right side
   2,086.78x = 3,290,237.50
5. Step 5: Solve for x
   x = 3,290,237.50/2,086.78
6. Step 6: Final answer
   x = 1,576.71