Finding the Fourth Proportional to 1,012.42, 1,397.03 and 570.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.42 : 1,397.03 = 570.31 : x
2. Step 2: Convert to fraction form
   1,012.42/1,397.03 = 570.31/x
3. Step 3: Cross multiply
   1,012.42x = 1,397.03 × 570.31
4. Step 4: Simplify right side
   1,012.42x = 796,740.18
5. Step 5: Solve for x
   x = 796,740.18/1,012.42
6. Step 6: Final answer
   x = 786.97