Finding the Fourth Proportional to 12,112.56, 18,172.26 and 10,955.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,112.56 : 18,172.26 = 10,955.88 : x
2. Step 2: Convert to fraction form
   12,112.56/18,172.26 = 10,955.88/x
3. Step 3: Cross multiply
   12,112.56x = 18,172.26 × 10,955.88
4. Step 4: Simplify right side
   12,112.56x = 199,093,099.89
5. Step 5: Solve for x
   x = 199,093,099.89/12,112.56
6. Step 6: Final answer
   x = 16,436.91