Finding the Fourth Proportional to 2,087.57, 3,131.45 and 1,721.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.57 : 3,131.45 = 1,721.69 : x
2. Step 2: Convert to fraction form
   2,087.57/3,131.45 = 1,721.69/x
3. Step 3: Cross multiply
   2,087.57x = 3,131.45 × 1,721.69
4. Step 4: Simplify right side
   2,087.57x = 5,391,386.15
5. Step 5: Solve for x
   x = 5,391,386.15/2,087.57
6. Step 6: Final answer
   x = 2,582.61