Finding the Fourth Proportional to 1,081.57, 1,622.98 and 456.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.57 : 1,622.98 = 456.82 : x
2. Step 2: Convert to fraction form
   1,081.57/1,622.98 = 456.82/x
3. Step 3: Cross multiply
   1,081.57x = 1,622.98 × 456.82
4. Step 4: Simplify right side
   1,081.57x = 741,409.72
5. Step 5: Solve for x
   x = 741,409.72/1,081.57
6. Step 6: Final answer
   x = 685.49