Finding the Fourth Proportional to 2,212.41, 3,315.95 and 978.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,212.41 : 3,315.95 = 978.42 : x
2. Step 2: Convert to fraction form
   2,212.41/3,315.95 = 978.42/x
3. Step 3: Cross multiply
   2,212.41x = 3,315.95 × 978.42
4. Step 4: Simplify right side
   2,212.41x = 3,244,391.80
5. Step 5: Solve for x
   x = 3,244,391.80/2,212.41
6. Step 6: Final answer
   x = 1,466.45