Finding the Fourth Proportional to 2,688.21, 3,709.52 and 1,509.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,688.21 : 3,709.52 = 1,509.05 : x
2. Step 2: Convert to fraction form
   2,688.21/3,709.52 = 1,509.05/x
3. Step 3: Cross multiply
   2,688.21x = 3,709.52 × 1,509.05
4. Step 4: Simplify right side
   2,688.21x = 5,597,858.54
5. Step 5: Solve for x
   x = 5,597,858.54/2,688.21
6. Step 6: Final answer
   x = 2,082.37