Finding the Fourth Proportional to 1,231.69, 1,701.39 and 1,144.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,231.69 : 1,701.39 = 1,144.21 : x
2. Step 2: Convert to fraction form
   1,231.69/1,701.39 = 1,144.21/x
3. Step 3: Cross multiply
   1,231.69x = 1,701.39 × 1,144.21
4. Step 4: Simplify right side
   1,231.69x = 1,946,747.45
5. Step 5: Solve for x
   x = 1,946,747.45/1,231.69
6. Step 6: Final answer
   x = 1,580.55