Finding the Fourth Proportional to 1,456.28, 2,180.82 and 1,085.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,456.28 : 2,180.82 = 1,085.20 : x
2. Step 2: Convert to fraction form
   1,456.28/2,180.82 = 1,085.20/x
3. Step 3: Cross multiply
   1,456.28x = 2,180.82 × 1,085.20
4. Step 4: Simplify right side
   1,456.28x = 2,366,624.48
5. Step 5: Solve for x
   x = 2,366,624.48/1,456.28
6. Step 6: Final answer
   x = 1,625.12