Finding the Fourth Proportional to 1,391.94, 1,920.92 and 894.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.94 : 1,920.92 = 894.78 : x
2. Step 2: Convert to fraction form
   1,391.94/1,920.92 = 894.78/x
3. Step 3: Cross multiply
   1,391.94x = 1,920.92 × 894.78
4. Step 4: Simplify right side
   1,391.94x = 1,718,796.32
5. Step 5: Solve for x
   x = 1,718,796.32/1,391.94
6. Step 6: Final answer
   x = 1,234.82