Finding the Fourth Proportional to 1,440.50, 1,987.89 and 819.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,440.50 : 1,987.89 = 819.54 : x
2. Step 2: Convert to fraction form
   1,440.50/1,987.89 = 819.54/x
3. Step 3: Cross multiply
   1,440.50x = 1,987.89 × 819.54
4. Step 4: Simplify right side
   1,440.50x = 1,629,155.37
5. Step 5: Solve for x
   x = 1,629,155.37/1,440.50
6. Step 6: Final answer
   x = 1,130.97