Finding the Fourth Proportional to 11,638.72, 17,444.20 and 8,109.62

Step by Step Solution

1. Step 1: Write the proportion equation
   11,638.72 : 17,444.20 = 8,109.62 : x
2. Step 2: Convert to fraction form
   11,638.72/17,444.20 = 8,109.62/x
3. Step 3: Cross multiply
   11,638.72x = 17,444.20 × 8,109.62
4. Step 4: Simplify right side
   11,638.72x = 141,465,833.20
5. Step 5: Solve for x
   x = 141,465,833.20/11,638.72
6. Step 6: Final answer
   x = 12,154.76