Finding the Fourth Proportional to 2,660.05, 3,997.40 and 1,428.37

Step by Step Solution

1. Step 1: Write the proportion equation
   2,660.05 : 3,997.40 = 1,428.37 : x
2. Step 2: Convert to fraction form
   2,660.05/3,997.40 = 1,428.37/x
3. Step 3: Cross multiply
   2,660.05x = 3,997.40 × 1,428.37
4. Step 4: Simplify right side
   2,660.05x = 5,709,759.10
5. Step 5: Solve for x
   x = 5,709,759.10/2,660.05
6. Step 6: Final answer
   x = 2,146.49