Finding the Fourth Proportional to 2,211.49, 3,317.10 and 978.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,211.49 : 3,317.10 = 978.54 : x
2. Step 2: Convert to fraction form
   2,211.49/3,317.10 = 978.54/x
3. Step 3: Cross multiply
   2,211.49x = 3,317.10 × 978.54
4. Step 4: Simplify right side
   2,211.49x = 3,245,915.03
5. Step 5: Solve for x
   x = 3,245,915.03/2,211.49
6. Step 6: Final answer
   x = 1,467.75