Finding the Fourth Proportional to 1,817.48, 2,728.61 and 1,078.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,817.48 : 2,728.61 = 1,078.45 : x
2. Step 2: Convert to fraction form
   1,817.48/2,728.61 = 1,078.45/x
3. Step 3: Cross multiply
   1,817.48x = 2,728.61 × 1,078.45
4. Step 4: Simplify right side
   1,817.48x = 2,942,669.45
5. Step 5: Solve for x
   x = 2,942,669.45/1,817.48
6. Step 6: Final answer
   x = 1,619.09