Finding the Fourth Proportional to 1,012.14, 1,396.76 and 570.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.14 : 1,396.76 = 570.15 : x
2. Step 2: Convert to fraction form
   1,012.14/1,396.76 = 570.15/x
3. Step 3: Cross multiply
   1,012.14x = 1,396.76 × 570.15
4. Step 4: Simplify right side
   1,012.14x = 796,359.86
5. Step 5: Solve for x
   x = 796,359.86/1,012.14
6. Step 6: Final answer
   x = 786.81