Finding the Fourth Proportional to 2,086.17, 2,879.43 and 1,247.37

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.17 : 2,879.43 = 1,247.37 : x
2. Step 2: Convert to fraction form
   2,086.17/2,879.43 = 1,247.37/x
3. Step 3: Cross multiply
   2,086.17x = 2,879.43 × 1,247.37
4. Step 4: Simplify right side
   2,086.17x = 3,591,727.74
5. Step 5: Solve for x
   x = 3,591,727.74/2,086.17
6. Step 6: Final answer
   x = 1,721.68