Finding the Fourth Proportional to 12,435.28, 18,647.34 and 3,667.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,435.28 : 18,647.34 = 3,667.12 : x
2. Step 2: Convert to fraction form
   12,435.28/18,647.34 = 3,667.12/x
3. Step 3: Cross multiply
   12,435.28x = 18,647.34 × 3,667.12
4. Step 4: Simplify right side
   12,435.28x = 68,382,033.46
5. Step 5: Solve for x
   x = 68,382,033.46/12,435.28
6. Step 6: Final answer
   x = 5,499.03