Finding the Fourth Proportional to 1,721.18, 2,581.71 and 488.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,721.18 : 2,581.71 = 488.57 : x
2. Step 2: Convert to fraction form
   1,721.18/2,581.71 = 488.57/x
3. Step 3: Cross multiply
   1,721.18x = 2,581.71 × 488.57
4. Step 4: Simplify right side
   1,721.18x = 1,261,333.15
5. Step 5: Solve for x
   x = 1,261,333.15/1,721.18
6. Step 6: Final answer
   x = 732.83