Finding the Fourth Proportional to 2,745.20, 3,780.25 and 2,687.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,745.20 : 3,780.25 = 2,687.69 : x
2. Step 2: Convert to fraction form
   2,745.20/3,780.25 = 2,687.69/x
3. Step 3: Cross multiply
   2,745.20x = 3,780.25 × 2,687.69
4. Step 4: Simplify right side
   2,745.20x = 10,160,114.50
5. Step 5: Solve for x
   x = 10,160,114.50/2,745.20
6. Step 6: Final answer
   x = 3,701.05