Finding the Fourth Proportional to 1,015.72, 1,401.55 and 573.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015.72 : 1,401.55 = 573.55 : x
2. Step 2: Convert to fraction form
   1,015.72/1,401.55 = 573.55/x
3. Step 3: Cross multiply
   1,015.72x = 1,401.55 × 573.55
4. Step 4: Simplify right side
   1,015.72x = 803,859.00
5. Step 5: Solve for x
   x = 803,859.00/1,015.72
6. Step 6: Final answer
   x = 791.42