Finding the Fourth Proportional to 12,218.62, 16,857.82 and 7,181.23

Step by Step Solution

1. Step 1: Write the proportion equation
   12,218.62 : 16,857.82 = 7,181.23 : x
2. Step 2: Convert to fraction form
   12,218.62/16,857.82 = 7,181.23/x
3. Step 3: Cross multiply
   12,218.62x = 16,857.82 × 7,181.23
4. Step 4: Simplify right side
   12,218.62x = 121,059,882.72
5. Step 5: Solve for x
   x = 121,059,882.72/12,218.62
6. Step 6: Final answer
   x = 9,907.82