Finding the Fourth Proportional to 2,015.40, 3,021.72 and 1,090.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,015.40 : 3,021.72 = 1,090.38 : x
2. Step 2: Convert to fraction form
   2,015.40/3,021.72 = 1,090.38/x
3. Step 3: Cross multiply
   2,015.40x = 3,021.72 × 1,090.38
4. Step 4: Simplify right side
   2,015.40x = 3,294,823.05
5. Step 5: Solve for x
   x = 3,294,823.05/2,015.40
6. Step 6: Final answer
   x = 1,634.82