Finding the Fourth Proportional to 2,087.46, 2,879.76 and 1,247.73

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.46 : 2,879.76 = 1,247.73 : x
2. Step 2: Convert to fraction form
   2,087.46/2,879.76 = 1,247.73/x
3. Step 3: Cross multiply
   2,087.46x = 2,879.76 × 1,247.73
4. Step 4: Simplify right side
   2,087.46x = 3,593,162.94
5. Step 5: Solve for x
   x = 3,593,162.94/2,087.46
6. Step 6: Final answer
   x = 1,721.31