Finding the Fourth Proportional to 2,211.69, 3,317.40 and 978.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,211.69 : 3,317.40 = 978.06 : x
2. Step 2: Convert to fraction form
   2,211.69/3,317.40 = 978.06/x
3. Step 3: Cross multiply
   2,211.69x = 3,317.40 × 978.06
4. Step 4: Simplify right side
   2,211.69x = 3,244,616.24
5. Step 5: Solve for x
   x = 3,244,616.24/2,211.69
6. Step 6: Final answer
   x = 1,467.03