Finding the Fourth Proportional to 1,820.48, 2,728.89 and 724.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,820.48 : 2,728.89 = 724.28 : x
2. Step 2: Convert to fraction form
   1,820.48/2,728.89 = 724.28/x
3. Step 3: Cross multiply
   1,820.48x = 2,728.89 × 724.28
4. Step 4: Simplify right side
   1,820.48x = 1,976,466.80
5. Step 5: Solve for x
   x = 1,976,466.80/1,820.48
6. Step 6: Final answer
   x = 1,085.69