Finding the Fourth Proportional to 2,519.72, 3,780.72 and 1,286.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,519.72 : 3,780.72 = 1,286.50 : x
2. Step 2: Convert to fraction form
   2,519.72/3,780.72 = 1,286.50/x
3. Step 3: Cross multiply
   2,519.72x = 3,780.72 × 1,286.50
4. Step 4: Simplify right side
   2,519.72x = 4,863,896.28
5. Step 5: Solve for x
   x = 4,863,896.28/2,519.72
6. Step 6: Final answer
   x = 1,930.33