Finding the Fourth Proportional to 1,391.71, 1,920.73 and 832.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.71 : 1,920.73 = 832.17 : x
2. Step 2: Convert to fraction form
   1,391.71/1,920.73 = 832.17/x
3. Step 3: Cross multiply
   1,391.71x = 1,920.73 × 832.17
4. Step 4: Simplify right side
   1,391.71x = 1,598,382.13
5. Step 5: Solve for x
   x = 1,598,382.13/1,391.71
6. Step 6: Final answer
   x = 1,148.50