Finding the Fourth Proportional to 1,013.65, 1,398.82 and 571.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,013.65 : 1,398.82 = 571.69 : x
2. Step 2: Convert to fraction form
   1,013.65/1,398.82 = 571.69/x
3. Step 3: Cross multiply
   1,013.65x = 1,398.82 × 571.69
4. Step 4: Simplify right side
   1,013.65x = 799,690.69
5. Step 5: Solve for x
   x = 799,690.69/1,013.65
6. Step 6: Final answer
   x = 788.92