Finding the Fourth Proportional to 1,636.38, 2,443.14 and 1,389.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,636.38 : 2,443.14 = 1,389.42 : x
2. Step 2: Convert to fraction form
   1,636.38/2,443.14 = 1,389.42/x
3. Step 3: Cross multiply
   1,636.38x = 2,443.14 × 1,389.42
4. Step 4: Simplify right side
   1,636.38x = 3,394,547.58
5. Step 5: Solve for x
   x = 3,394,547.58/1,636.38
6. Step 6: Final answer
   x = 2,074.42