Finding the Fourth Proportional to 2,086.54, 2,880 and 1,247.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.54 : 2,880 = 1,247.82 : x
2. Step 2: Convert to fraction form
   2,086.54/2,880 = 1,247.82/x
3. Step 3: Cross multiply
   2,086.54x = 2,880 × 1,247.82
4. Step 4: Simplify right side
   2,086.54x = 3,593,721.60
5. Step 5: Solve for x
   x = 3,593,721.60/2,086.54
6. Step 6: Final answer
   x = 1,722.34