Finding the Fourth Proportional to 1,456.89, 2,183.61 and 839.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,456.89 : 2,183.61 = 839.32 : x
2. Step 2: Convert to fraction form
   1,456.89/2,183.61 = 839.32/x
3. Step 3: Cross multiply
   1,456.89x = 2,183.61 × 839.32
4. Step 4: Simplify right side
   1,456.89x = 1,832,746.65
5. Step 5: Solve for x
   x = 1,832,746.65/1,456.89
6. Step 6: Final answer
   x = 1,257.98