Finding the Fourth Proportional to 2,622.91, 3,933.15 and 978.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,622.91 : 3,933.15 = 978.27 : x
2. Step 2: Convert to fraction form
   2,622.91/3,933.15 = 978.27/x
3. Step 3: Cross multiply
   2,622.91x = 3,933.15 × 978.27
4. Step 4: Simplify right side
   2,622.91x = 3,847,677.76
5. Step 5: Solve for x
   x = 3,847,677.76/2,622.91
6. Step 6: Final answer
   x = 1,466.95