Finding the Fourth Proportional to 2,509.20, 3,462.57 and 1,390.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,509.20 : 3,462.57 = 1,390.05 : x
2. Step 2: Convert to fraction form
   2,509.20/3,462.57 = 1,390.05/x
3. Step 3: Cross multiply
   2,509.20x = 3,462.57 × 1,390.05
4. Step 4: Simplify right side
   2,509.20x = 4,813,145.43
5. Step 5: Solve for x
   x = 4,813,145.43/2,509.20
6. Step 6: Final answer
   x = 1,918.20