Finding the Fourth Proportional to 1,039.46, 1,434.42 and 573.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.46 : 1,434.42 = 573.72 : x
2. Step 2: Convert to fraction form
   1,039.46/1,434.42 = 573.72/x
3. Step 3: Cross multiply
   1,039.46x = 1,434.42 × 573.72
4. Step 4: Simplify right side
   1,039.46x = 822,955.44
5. Step 5: Solve for x
   x = 822,955.44/1,039.46
6. Step 6: Final answer
   x = 791.71