Finding the Fourth Proportional to 1,012.18, 1,396.84 and 570.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.18 : 1,396.84 = 570.10 : x
2. Step 2: Convert to fraction form
   1,012.18/1,396.84 = 570.10/x
3. Step 3: Cross multiply
   1,012.18x = 1,396.84 × 570.10
4. Step 4: Simplify right side
   1,012.18x = 796,328.65
5. Step 5: Solve for x
   x = 796,328.65/1,012.18
6. Step 6: Final answer
   x = 786.75