Finding the Fourth Proportional to 2,187.99, 3,019.86 and 1,721.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,187.99 : 3,019.86 = 1,721.43 : x
2. Step 2: Convert to fraction form
   2,187.99/3,019.86 = 1,721.43/x
3. Step 3: Cross multiply
   2,187.99x = 3,019.86 × 1,721.43
4. Step 4: Simplify right side
   2,187.99x = 5,198,477.60
5. Step 5: Solve for x
   x = 5,198,477.60/2,187.99
6. Step 6: Final answer
   x = 2,375.91