Finding the Fourth Proportional to 12,443.50, 17,172.03 and 7,138.09

Step by Step Solution

1. Step 1: Write the proportion equation
   12,443.50 : 17,172.03 = 7,138.09 : x
2. Step 2: Convert to fraction form
   12,443.50/17,172.03 = 7,138.09/x
3. Step 3: Cross multiply
   12,443.50x = 17,172.03 × 7,138.09
4. Step 4: Simplify right side
   12,443.50x = 122,575,495.62
5. Step 5: Solve for x
   x = 122,575,495.62/12,443.50
6. Step 6: Final answer
   x = 9,850.56