Finding the Fourth Proportional to 2,438.69, 3,365.43 and 1,390.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,438.69 : 3,365.43 = 1,390.69 : x
2. Step 2: Convert to fraction form
   2,438.69/3,365.43 = 1,390.69/x
3. Step 3: Cross multiply
   2,438.69x = 3,365.43 × 1,390.69
4. Step 4: Simplify right side
   2,438.69x = 4,680,253.02
5. Step 5: Solve for x
   x = 4,680,253.02/2,438.69
6. Step 6: Final answer
   x = 1,919.17