Finding the Fourth Proportional to 2,086.57, 2,879.45 and 1,340.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.57 : 2,879.45 = 1,340.81 : x
2. Step 2: Convert to fraction form
   2,086.57/2,879.45 = 1,340.81/x
3. Step 3: Cross multiply
   2,086.57x = 2,879.45 × 1,340.81
4. Step 4: Simplify right side
   2,086.57x = 3,860,795.35
5. Step 5: Solve for x
   x = 3,860,795.35/2,086.57
6. Step 6: Final answer
   x = 1,850.31