Finding the Fourth Proportional to 2,211.33, 3,316.49 and 978.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,211.33 : 3,316.49 = 978.07 : x
2. Step 2: Convert to fraction form
   2,211.33/3,316.49 = 978.07/x
3. Step 3: Cross multiply
   2,211.33x = 3,316.49 × 978.07
4. Step 4: Simplify right side
   2,211.33x = 3,243,759.37
5. Step 5: Solve for x
   x = 3,243,759.37/2,211.33
6. Step 6: Final answer
   x = 1,466.88