Finding the Fourth Proportional to 2,336.05, 3,223.34 and 1,391.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,336.05 : 3,223.34 = 1,391.72 : x
2. Step 2: Convert to fraction form
   2,336.05/3,223.34 = 1,391.72/x
3. Step 3: Cross multiply
   2,336.05x = 3,223.34 × 1,391.72
4. Step 4: Simplify right side
   2,336.05x = 4,485,986.74
5. Step 5: Solve for x
   x = 4,485,986.74/2,336.05
6. Step 6: Final answer
   x = 1,920.33