Finding the Fourth Proportional to 12,436.58, 17,163.72 and 9,287.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,436.58 : 17,163.72 = 9,287.30 : x
2. Step 2: Convert to fraction form
   12,436.58/17,163.72 = 9,287.30/x
3. Step 3: Cross multiply
   12,436.58x = 17,163.72 × 9,287.30
4. Step 4: Simplify right side
   12,436.58x = 159,404,616.76
5. Step 5: Solve for x
   x = 159,404,616.76/12,436.58
6. Step 6: Final answer
   x = 12,817.40