Finding the Fourth Proportional to 1,039.15, 1,435.76 and 819.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.15 : 1,435.76 = 819.78 : x
2. Step 2: Convert to fraction form
   1,039.15/1,435.76 = 819.78/x
3. Step 3: Cross multiply
   1,039.15x = 1,435.76 × 819.78
4. Step 4: Simplify right side
   1,039.15x = 1,177,007.33
5. Step 5: Solve for x
   x = 1,177,007.33/1,039.15
6. Step 6: Final answer
   x = 1,132.66