Finding the Fourth Proportional to 2,190.21, 3,022.41 and 1,305.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,190.21 : 3,022.41 = 1,305.55 : x
2. Step 2: Convert to fraction form
   2,190.21/3,022.41 = 1,305.55/x
3. Step 3: Cross multiply
   2,190.21x = 3,022.41 × 1,305.55
4. Step 4: Simplify right side
   2,190.21x = 3,945,907.38
5. Step 5: Solve for x
   x = 3,945,907.38/2,190.21
6. Step 6: Final answer
   x = 1,801.61