Finding the Fourth Proportional to 11,198.88, 15,444.72 and 7,218.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,198.88 : 15,444.72 = 7,218.72 : x
2. Step 2: Convert to fraction form
   11,198.88/15,444.72 = 7,218.72/x
3. Step 3: Cross multiply
   11,198.88x = 15,444.72 × 7,218.72
4. Step 4: Simplify right side
   11,198.88x = 111,491,109.16
5. Step 5: Solve for x
   x = 111,491,109.16/11,198.88
6. Step 6: Final answer
   x = 9,955.56