Finding the Fourth Proportional to 2,019.29, 2,788.74 and 1,391.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,019.29 : 2,788.74 = 1,391.45 : x
2. Step 2: Convert to fraction form
   2,019.29/2,788.74 = 1,391.45/x
3. Step 3: Cross multiply
   2,019.29x = 2,788.74 × 1,391.45
4. Step 4: Simplify right side
   2,019.29x = 3,880,392.27
5. Step 5: Solve for x
   x = 3,880,392.27/2,019.29
6. Step 6: Final answer
   x = 1,921.66