Finding the Fourth Proportional to 1,391.93, 1,920.81 and 832.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.93 : 1,920.81 = 832.71 : x
2. Step 2: Convert to fraction form
   1,391.93/1,920.81 = 832.71/x
3. Step 3: Cross multiply
   1,391.93x = 1,920.81 × 832.71
4. Step 4: Simplify right side
   1,391.93x = 1,599,482.86
5. Step 5: Solve for x
   x = 1,599,482.86/1,391.93
6. Step 6: Final answer
   x = 1,149.11