Finding the Fourth Proportional to 1,036.72, 1,421.39 and 1,018.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,036.72 : 1,421.39 = 1,018.27 : x
2. Step 2: Convert to fraction form
   1,036.72/1,421.39 = 1,018.27/x
3. Step 3: Cross multiply
   1,036.72x = 1,421.39 × 1,018.27
4. Step 4: Simplify right side
   1,036.72x = 1,447,358.80
5. Step 5: Solve for x
   x = 1,447,358.80/1,036.72
6. Step 6: Final answer
   x = 1,396.09