Finding the Fourth Proportional to 1,043.99, 1,440.69 and 571.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,043.99 : 1,440.69 = 571.89 : x
2. Step 2: Convert to fraction form
   1,043.99/1,440.69 = 571.89/x
3. Step 3: Cross multiply
   1,043.99x = 1,440.69 × 571.89
4. Step 4: Simplify right side
   1,043.99x = 823,919.46
5. Step 5: Solve for x
   x = 823,919.46/1,043.99
6. Step 6: Final answer
   x = 789.20