Finding the Fourth Proportional to 2,243.20, 3,362.72 and 1,721.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,243.20 : 3,362.72 = 1,721.60 : x
2. Step 2: Convert to fraction form
   2,243.20/3,362.72 = 1,721.60/x
3. Step 3: Cross multiply
   2,243.20x = 3,362.72 × 1,721.60
4. Step 4: Simplify right side
   2,243.20x = 5,789,258.75
5. Step 5: Solve for x
   x = 5,789,258.75/2,243.20
6. Step 6: Final answer
   x = 2,580.80