Finding the Fourth Proportional to 2,021.40, 3,030.27 and 1,405.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,021.40 : 3,030.27 = 1,405.40 : x
2. Step 2: Convert to fraction form
   2,021.40/3,030.27 = 1,405.40/x
3. Step 3: Cross multiply
   2,021.40x = 3,030.27 × 1,405.40
4. Step 4: Simplify right side
   2,021.40x = 4,258,726.31
5. Step 5: Solve for x
   x = 4,258,726.31/2,021.40
6. Step 6: Final answer
   x = 2,106.82