Finding the Fourth Proportional to 2,391.57, 3,300.74 and 1,721.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,391.57 : 3,300.74 = 1,721.60 : x
2. Step 2: Convert to fraction form
   2,391.57/3,300.74 = 1,721.60/x
3. Step 3: Cross multiply
   2,391.57x = 3,300.74 × 1,721.60
4. Step 4: Simplify right side
   2,391.57x = 5,682,528.87
5. Step 5: Solve for x
   x = 5,682,528.87/2,391.57
6. Step 6: Final answer
   x = 2,376.07