Finding the Fourth Proportional to 1,039.76, 1,435.92 and 818.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.76 : 1,435.92 = 818.72 : x
2. Step 2: Convert to fraction form
   1,039.76/1,435.92 = 818.72/x
3. Step 3: Cross multiply
   1,039.76x = 1,435.92 × 818.72
4. Step 4: Simplify right side
   1,039.76x = 1,175,616.42
5. Step 5: Solve for x
   x = 1,175,616.42/1,039.76
6. Step 6: Final answer
   x = 1,130.66