Finding the Fourth Proportional to 1,391.81, 1,920.90 and 832.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.81 : 1,920.90 = 832.29 : x
2. Step 2: Convert to fraction form
   1,391.81/1,920.90 = 832.29/x
3. Step 3: Cross multiply
   1,391.81x = 1,920.90 × 832.29
4. Step 4: Simplify right side
   1,391.81x = 1,598,745.86
5. Step 5: Solve for x
   x = 1,598,745.86/1,391.81
6. Step 6: Final answer
   x = 1,148.69