Finding the Fourth Proportional to 1,013.82, 1,398.99 and 571.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,013.82 : 1,398.99 = 571.78 : x
2. Step 2: Convert to fraction form
   1,013.82/1,398.99 = 571.78/x
3. Step 3: Cross multiply
   1,013.82x = 1,398.99 × 571.78
4. Step 4: Simplify right side
   1,013.82x = 799,914.50
5. Step 5: Solve for x
   x = 799,914.50/1,013.82
6. Step 6: Final answer
   x = 789.01