Finding the Fourth Proportional to 1,081.29, 1,622.56 and 456.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.29 : 1,622.56 = 456.54 : x
2. Step 2: Convert to fraction form
   1,081.29/1,622.56 = 456.54/x
3. Step 3: Cross multiply
   1,081.29x = 1,622.56 × 456.54
4. Step 4: Simplify right side
   1,081.29x = 740,763.54
5. Step 5: Solve for x
   x = 740,763.54/1,081.29
6. Step 6: Final answer
   x = 685.07