Finding the Fourth Proportional to 1,057.82, 1,587.18 and 570.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,057.82 : 1,587.18 = 570.31 : x
2. Step 2: Convert to fraction form
   1,057.82/1,587.18 = 570.31/x
3. Step 3: Cross multiply
   1,057.82x = 1,587.18 × 570.31
4. Step 4: Simplify right side
   1,057.82x = 905,178.12
5. Step 5: Solve for x
   x = 905,178.12/1,057.82
6. Step 6: Final answer
   x = 855.70