Finding the Fourth Proportional to 1,015.71, 1,401.71 and 573.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015.71 : 1,401.71 = 573.64 : x
2. Step 2: Convert to fraction form
   1,015.71/1,401.71 = 573.64/x
3. Step 3: Cross multiply
   1,015.71x = 1,401.71 × 573.64
4. Step 4: Simplify right side
   1,015.71x = 804,076.92
5. Step 5: Solve for x
   x = 804,076.92/1,015.71
6. Step 6: Final answer
   x = 791.64