Finding the Fourth Proportional to 3,912.67, 5,870.91 and 1,721.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,912.67 : 5,870.91 = 1,721.12 : x
2. Step 2: Convert to fraction form
   3,912.67/5,870.91 = 1,721.12/x
3. Step 3: Cross multiply
   3,912.67x = 5,870.91 × 1,721.12
4. Step 4: Simplify right side
   3,912.67x = 10,104,540.62
5. Step 5: Solve for x
   x = 10,104,540.62/3,912.67
6. Step 6: Final answer
   x = 2,582.52