Finding the Fourth Proportional to 13,106, 18,086.28 and 7,218

Step by Step Solution

1. Step 1: Write the proportion equation
   13,106 : 18,086.28 = 7,218 : x
2. Step 2: Convert to fraction form
   13,106/18,086.28 = 7,218/x
3. Step 3: Cross multiply
   13,106x = 18,086.28 × 7,218
4. Step 4: Simplify right side
   13,106x = 130,546,769.04
5. Step 5: Solve for x
   x = 130,546,769.04/13,106
6. Step 6: Final answer
   x = 9,960.84