Finding the Fourth Proportional to 12,111.88, 18,165.66 and 5,538.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,111.88 : 18,165.66 = 5,538.28 : x
2. Step 2: Convert to fraction form
   12,111.88/18,165.66 = 5,538.28/x
3. Step 3: Cross multiply
   12,111.88x = 18,165.66 × 5,538.28
4. Step 4: Simplify right side
   12,111.88x = 100,606,511.46
5. Step 5: Solve for x
   x = 100,606,511.46/12,111.88
6. Step 6: Final answer
   x = 8,306.43