Finding the Fourth Proportional to 2,107.98, 2,907.41 and 1,398.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,107.98 : 2,907.41 = 1,398.56 : x
2. Step 2: Convert to fraction form
   2,107.98/2,907.41 = 1,398.56/x
3. Step 3: Cross multiply
   2,107.98x = 2,907.41 × 1,398.56
4. Step 4: Simplify right side
   2,107.98x = 4,066,165.80
5. Step 5: Solve for x
   x = 4,066,165.80/2,107.98
6. Step 6: Final answer
   x = 1,928.94