Finding the Fourth Proportional to 1,015.78, 1,401.73 and 573.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015.78 : 1,401.73 = 573.69 : x
2. Step 2: Convert to fraction form
   1,015.78/1,401.73 = 573.69/x
3. Step 3: Cross multiply
   1,015.78x = 1,401.73 × 573.69
4. Step 4: Simplify right side
   1,015.78x = 804,158.48
5. Step 5: Solve for x
   x = 804,158.48/1,015.78
6. Step 6: Final answer
   x = 791.67