Finding the Fourth Proportional to 1,013.94, 1,399.31 and 571.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,013.94 : 1,399.31 = 571.93 : x
2. Step 2: Convert to fraction form
   1,013.94/1,399.31 = 571.93/x
3. Step 3: Cross multiply
   1,013.94x = 1,399.31 × 571.93
4. Step 4: Simplify right side
   1,013.94x = 800,309.00
5. Step 5: Solve for x
   x = 800,309.00/1,013.94
6. Step 6: Final answer
   x = 789.31