Finding the Fourth Proportional to 2,391.91, 3,300.73 and 1,397.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,391.91 : 3,300.73 = 1,397.28 : x
2. Step 2: Convert to fraction form
   2,391.91/3,300.73 = 1,397.28/x
3. Step 3: Cross multiply
   2,391.91x = 3,300.73 × 1,397.28
4. Step 4: Simplify right side
   2,391.91x = 4,612,044.01
5. Step 5: Solve for x
   x = 4,612,044.01/2,391.91
6. Step 6: Final answer
   x = 1,928.18