Finding the Fourth Proportional to 1,399.20, 1,933.56 and 1,049.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.20 : 1,933.56 = 1,049.28 : x
2. Step 2: Convert to fraction form
   1,399.20/1,933.56 = 1,049.28/x
3. Step 3: Cross multiply
   1,399.20x = 1,933.56 × 1,049.28
4. Step 4: Simplify right side
   1,399.20x = 2,028,845.84
5. Step 5: Solve for x
   x = 2,028,845.84/1,399.20
6. Step 6: Final answer
   x = 1,450.00