Finding the Fourth Proportional to 12,443.18, 17,170.89 and 7,137.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,443.18 : 17,170.89 = 7,137.50 : x
2. Step 2: Convert to fraction form
   12,443.18/17,170.89 = 7,137.50/x
3. Step 3: Cross multiply
   12,443.18x = 17,170.89 × 7,137.50
4. Step 4: Simplify right side
   12,443.18x = 122,557,227.38
5. Step 5: Solve for x
   x = 122,557,227.38/12,443.18
6. Step 6: Final answer
   x = 9,849.35