Finding the Fourth Proportional to 2,190.61, 3,022.49 and 1,405.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,190.61 : 3,022.49 = 1,405.72 : x
2. Step 2: Convert to fraction form
   2,190.61/3,022.49 = 1,405.72/x
3. Step 3: Cross multiply
   2,190.61x = 3,022.49 × 1,405.72
4. Step 4: Simplify right side
   2,190.61x = 4,248,774.64
5. Step 5: Solve for x
   x = 4,248,774.64/2,190.61
6. Step 6: Final answer
   x = 1,939.54