Finding the Fourth Proportional to 1,721.69, 2,584.38 and 1,291.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,721.69 : 2,584.38 = 1,291.58 : x
2. Step 2: Convert to fraction form
   1,721.69/2,584.38 = 1,291.58/x
3. Step 3: Cross multiply
   1,721.69x = 2,584.38 × 1,291.58
4. Step 4: Simplify right side
   1,721.69x = 3,337,920.60
5. Step 5: Solve for x
   x = 3,337,920.60/1,721.69
6. Step 6: Final answer
   x = 1,938.75