Finding the Fourth Proportional to 1,057.49, 1,586.69 and 570.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057.49 : 1,586.69 = 570.38 : x
2. Step 2: Convert to fraction form
   1,057.49/1,586.69 = 570.38/x
3. Step 3: Cross multiply
   1,057.49x = 1,586.69 × 570.38
4. Step 4: Simplify right side
   1,057.49x = 905,007.60
5. Step 5: Solve for x
   x = 905,007.60/1,057.49
6. Step 6: Final answer
   x = 855.81