Finding the Fourth Proportional to 3,911.91, 5,863.86 and 1,720.23

Step by Step Solution

1. Step 1: Write the proportion equation
   3,911.91 : 5,863.86 = 1,720.23 : x
2. Step 2: Convert to fraction form
   3,911.91/5,863.86 = 1,720.23/x
3. Step 3: Cross multiply
   3,911.91x = 5,863.86 × 1,720.23
4. Step 4: Simplify right side
   3,911.91x = 10,087,187.89
5. Step 5: Solve for x
   x = 10,087,187.89/3,911.91
6. Step 6: Final answer
   x = 2,578.58