Finding the Fourth Proportional to 3,912.89, 5,871.23 and 1,721.33

Step by Step Solution

1. Step 1: Write the proportion equation
   3,912.89 : 5,871.23 = 1,721.33 : x
2. Step 2: Convert to fraction form
   3,912.89/5,871.23 = 1,721.33/x
3. Step 3: Cross multiply
   3,912.89x = 5,871.23 × 1,721.33
4. Step 4: Simplify right side
   3,912.89x = 10,106,343.32
5. Step 5: Solve for x
   x = 10,106,343.32/3,912.89
6. Step 6: Final answer
   x = 2,582.83