Finding the Fourth Proportional to 2,438.69, 3,365.55 and 1,390.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,438.69 : 3,365.55 = 1,390.82 : x
2. Step 2: Convert to fraction form
   2,438.69/3,365.55 = 1,390.82/x
3. Step 3: Cross multiply
   2,438.69x = 3,365.55 × 1,390.82
4. Step 4: Simplify right side
   2,438.69x = 4,680,857.42
5. Step 5: Solve for x
   x = 4,680,857.42/2,438.69
6. Step 6: Final answer
   x = 1,919.42