Finding the Fourth Proportional to 1,013.49, 1,398.61 and 571.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,013.49 : 1,398.61 = 571.38 : x
2. Step 2: Convert to fraction form
   1,013.49/1,398.61 = 571.38/x
3. Step 3: Cross multiply
   1,013.49x = 1,398.61 × 571.38
4. Step 4: Simplify right side
   1,013.49x = 799,137.78
5. Step 5: Solve for x
   x = 799,137.78/1,013.49
6. Step 6: Final answer
   x = 788.50