Finding the Fourth Proportional to 2,086.74, 2,879.68 and 1,142.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.74 : 2,879.68 = 1,142.55 : x
2. Step 2: Convert to fraction form
   2,086.74/2,879.68 = 1,142.55/x
3. Step 3: Cross multiply
   2,086.74x = 2,879.68 × 1,142.55
4. Step 4: Simplify right side
   2,086.74x = 3,290,178.38
5. Step 5: Solve for x
   x = 3,290,178.38/2,086.74
6. Step 6: Final answer
   x = 1,576.71