Finding the Fourth Proportional to 2,622.12, 3,930.68 and 978.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,622.12 : 3,930.68 = 978.23 : x
2. Step 2: Convert to fraction form
   2,622.12/3,930.68 = 978.23/x
3. Step 3: Cross multiply
   2,622.12x = 3,930.68 × 978.23
4. Step 4: Simplify right side
   2,622.12x = 3,845,093.76
5. Step 5: Solve for x
   x = 3,845,093.76/2,622.12
6. Step 6: Final answer
   x = 1,466.41