Finding the Fourth Proportional to 12,390.30, 18,585.86 and 3,626.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,390.30 : 18,585.86 = 3,626.10 : x
2. Step 2: Convert to fraction form
   12,390.30/18,585.86 = 3,626.10/x
3. Step 3: Cross multiply
   12,390.30x = 18,585.86 × 3,626.10
4. Step 4: Simplify right side
   12,390.30x = 67,394,168.82
5. Step 5: Solve for x
   x = 67,394,168.82/12,390.30
6. Step 6: Final answer
   x = 5,439.27