Finding the Fourth Proportional to 2,308.91, 3,187.55 and 1,720.85

Step by Step Solution

1. Step 1: Write the proportion equation
   2,308.91 : 3,187.55 = 1,720.85 : x
2. Step 2: Convert to fraction form
   2,308.91/3,187.55 = 1,720.85/x
3. Step 3: Cross multiply
   2,308.91x = 3,187.55 × 1,720.85
4. Step 4: Simplify right side
   2,308.91x = 5,485,283.78
5. Step 5: Solve for x
   x = 5,485,283.78/2,308.91
6. Step 6: Final answer
   x = 2,375.71