Finding the Fourth Proportional to 2,622.56, 3,934.20 and 890.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,622.56 : 3,934.20 = 890.72 : x
2. Step 2: Convert to fraction form
   2,622.56/3,934.20 = 890.72/x
3. Step 3: Cross multiply
   2,622.56x = 3,934.20 × 890.72
4. Step 4: Simplify right side
   2,622.56x = 3,504,270.62
5. Step 5: Solve for x
   x = 3,504,270.62/2,622.56
6. Step 6: Final answer
   x = 1,336.20