Finding the Fourth Proportional to 1,013.59, 1,398.67 and 571.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,013.59 : 1,398.67 = 571.47 : x
2. Step 2: Convert to fraction form
   1,013.59/1,398.67 = 571.47/x
3. Step 3: Cross multiply
   1,013.59x = 1,398.67 × 571.47
4. Step 4: Simplify right side
   1,013.59x = 799,297.94
5. Step 5: Solve for x
   x = 799,297.94/1,013.59
6. Step 6: Final answer
   x = 788.58