Finding the Fourth Proportional to 2,054.69, 2,837.90 and 1,390.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,054.69 : 2,837.90 = 1,390.39 : x
2. Step 2: Convert to fraction form
   2,054.69/2,837.90 = 1,390.39/x
3. Step 3: Cross multiply
   2,054.69x = 2,837.90 × 1,390.39
4. Step 4: Simplify right side
   2,054.69x = 3,945,787.78
5. Step 5: Solve for x
   x = 3,945,787.78/2,054.69
6. Step 6: Final answer
   x = 1,920.38