Finding the Fourth Proportional to 12,198.72, 18,300.62 and 6,936.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,198.72 : 18,300.62 = 6,936.15 : x
2. Step 2: Convert to fraction form
   12,198.72/18,300.62 = 6,936.15/x
3. Step 3: Cross multiply
   12,198.72x = 18,300.62 × 6,936.15
4. Step 4: Simplify right side
   12,198.72x = 126,935,845.41
5. Step 5: Solve for x
   x = 126,935,845.41/12,198.72
6. Step 6: Final answer
   x = 10,405.67