Finding the Fourth Proportional to 2,509.07, 3,462.36 and 1,390.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,509.07 : 3,462.36 = 1,390.06 : x
2. Step 2: Convert to fraction form
   2,509.07/3,462.36 = 1,390.06/x
3. Step 3: Cross multiply
   2,509.07x = 3,462.36 × 1,390.06
4. Step 4: Simplify right side
   2,509.07x = 4,812,870.83
5. Step 5: Solve for x
   x = 4,812,870.83/2,509.07
6. Step 6: Final answer
   x = 1,918.19