Finding the Fourth Proportional to 2,078.40, 3,131.88 and 1,721.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,078.40 : 3,131.88 = 1,721.16 : x
2. Step 2: Convert to fraction form
   2,078.40/3,131.88 = 1,721.16/x
3. Step 3: Cross multiply
   2,078.40x = 3,131.88 × 1,721.16
4. Step 4: Simplify right side
   2,078.40x = 5,390,466.58
5. Step 5: Solve for x
   x = 5,390,466.58/2,078.40
6. Step 6: Final answer
   x = 2,593.57