Finding the Fourth Proportional to 15,549.49, 21,446.72 and 12,185.61

Step by Step Solution

1. Step 1: Write the proportion equation
   15,549.49 : 21,446.72 = 12,185.61 : x
2. Step 2: Convert to fraction form
   15,549.49/21,446.72 = 12,185.61/x
3. Step 3: Cross multiply
   15,549.49x = 21,446.72 × 12,185.61
4. Step 4: Simplify right side
   15,549.49x = 261,341,519.54
5. Step 5: Solve for x
   x = 261,341,519.54/15,549.49
6. Step 6: Final answer
   x = 16,807.08