Finding the Fourth Proportional to 1,448.69, 1,997.71 and 1,239.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,448.69 : 1,997.71 = 1,239.55 : x
2. Step 2: Convert to fraction form
   1,448.69/1,997.71 = 1,239.55/x
3. Step 3: Cross multiply
   1,448.69x = 1,997.71 × 1,239.55
4. Step 4: Simplify right side
   1,448.69x = 2,476,271.55
5. Step 5: Solve for x
   x = 2,476,271.55/1,448.69
6. Step 6: Final answer
   x = 1,709.32