Finding the Fourth Proportional to 1,721.39, 2,578.92 and 1,105.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,721.39 : 2,578.92 = 1,105.17 : x
2. Step 2: Convert to fraction form
   1,721.39/2,578.92 = 1,105.17/x
3. Step 3: Cross multiply
   1,721.39x = 2,578.92 × 1,105.17
4. Step 4: Simplify right side
   1,721.39x = 2,850,145.02
5. Step 5: Solve for x
   x = 2,850,145.02/1,721.39
6. Step 6: Final answer
   x = 1,655.73