Finding the Fourth Proportional to 1,039.50, 1,434.51 and 573.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.50 : 1,434.51 = 573.78 : x
2. Step 2: Convert to fraction form
   1,039.50/1,434.51 = 573.78/x
3. Step 3: Cross multiply
   1,039.50x = 1,434.51 × 573.78
4. Step 4: Simplify right side
   1,039.50x = 823,093.15
5. Step 5: Solve for x
   x = 823,093.15/1,039.50
6. Step 6: Final answer
   x = 791.82