Finding the Fourth Proportional to 2,190.78, 3,021.57 and 1,404.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,190.78 : 3,021.57 = 1,404.90 : x
2. Step 2: Convert to fraction form
   2,190.78/3,021.57 = 1,404.90/x
3. Step 3: Cross multiply
   2,190.78x = 3,021.57 × 1,404.90
4. Step 4: Simplify right side
   2,190.78x = 4,245,003.69
5. Step 5: Solve for x
   x = 4,245,003.69/2,190.78
6. Step 6: Final answer
   x = 1,937.67