Finding the Fourth Proportional to 1,721.53, 2,580.55 and 681.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,721.53 : 2,580.55 = 681.12 : x
2. Step 2: Convert to fraction form
   1,721.53/2,580.55 = 681.12/x
3. Step 3: Cross multiply
   1,721.53x = 2,580.55 × 681.12
4. Step 4: Simplify right side
   1,721.53x = 1,757,664.22
5. Step 5: Solve for x
   x = 1,757,664.22/1,721.53
6. Step 6: Final answer
   x = 1,020.99