Finding the Fourth Proportional to 1,012.41, 1,396.41 and 978.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.41 : 1,396.41 = 978.54 : x
2. Step 2: Convert to fraction form
   1,012.41/1,396.41 = 978.54/x
3. Step 3: Cross multiply
   1,012.41x = 1,396.41 × 978.54
4. Step 4: Simplify right side
   1,012.41x = 1,366,443.04
5. Step 5: Solve for x
   x = 1,366,443.04/1,012.41
6. Step 6: Final answer
   x = 1,349.69