Finding the Fourth Proportional to 1,143.41, 1,576.71 and 978.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,143.41 : 1,576.71 = 978.17 : x
2. Step 2: Convert to fraction form
   1,143.41/1,576.71 = 978.17/x
3. Step 3: Cross multiply
   1,143.41x = 1,576.71 × 978.17
4. Step 4: Simplify right side
   1,143.41x = 1,542,282.54
5. Step 5: Solve for x
   x = 1,542,282.54/1,143.41
6. Step 6: Final answer
   x = 1,348.85