Finding the Fourth Proportional to 1,391.63, 1,920.38 and 832.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.63 : 1,920.38 = 832.16 : x
2. Step 2: Convert to fraction form
   1,391.63/1,920.38 = 832.16/x
3. Step 3: Cross multiply
   1,391.63x = 1,920.38 × 832.16
4. Step 4: Simplify right side
   1,391.63x = 1,598,055.90
5. Step 5: Solve for x
   x = 1,598,055.90/1,391.63
6. Step 6: Final answer
   x = 1,148.33