Finding the Fourth Proportional to 1,013.89, 1,399.13 and 571.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,013.89 : 1,399.13 = 571.73 : x
2. Step 2: Convert to fraction form
   1,013.89/1,399.13 = 571.73/x
3. Step 3: Cross multiply
   1,013.89x = 1,399.13 × 571.73
4. Step 4: Simplify right side
   1,013.89x = 799,924.59
5. Step 5: Solve for x
   x = 799,924.59/1,013.89
6. Step 6: Final answer
   x = 788.97