Finding the Fourth Proportional to 1,039.74, 1,433.83 and 803.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.74 : 1,433.83 = 803.31 : x
2. Step 2: Convert to fraction form
   1,039.74/1,433.83 = 803.31/x
3. Step 3: Cross multiply
   1,039.74x = 1,433.83 × 803.31
4. Step 4: Simplify right side
   1,039.74x = 1,151,809.98
5. Step 5: Solve for x
   x = 1,151,809.98/1,039.74
6. Step 6: Final answer
   x = 1,107.79