Finding the Fourth Proportional to 2,189.43, 3,021.71 and 1,405.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,189.43 : 3,021.71 = 1,405.76 : x
2. Step 2: Convert to fraction form
   2,189.43/3,021.71 = 1,405.76/x
3. Step 3: Cross multiply
   2,189.43x = 3,021.71 × 1,405.76
4. Step 4: Simplify right side
   2,189.43x = 4,247,776.91
5. Step 5: Solve for x
   x = 4,247,776.91/2,189.43
6. Step 6: Final answer
   x = 1,940.13