Finding the Fourth Proportional to 13,168.50, 18,172.56 and 7,579.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,168.50 : 18,172.56 = 7,579.50 : x
2. Step 2: Convert to fraction form
   13,168.50/18,172.56 = 7,579.50/x
3. Step 3: Cross multiply
   13,168.50x = 18,172.56 × 7,579.50
4. Step 4: Simplify right side
   13,168.50x = 137,738,918.52
5. Step 5: Solve for x
   x = 137,738,918.52/13,168.50
6. Step 6: Final answer
   x = 10,459.73