Finding the Fourth Proportional to 18,518.72, 27,676.16 and 13,531.47

Step by Step Solution

1. Step 1: Write the proportion equation
   18,518.72 : 27,676.16 = 13,531.47 : x
2. Step 2: Convert to fraction form
   18,518.72/27,676.16 = 13,531.47/x
3. Step 3: Cross multiply
   18,518.72x = 27,676.16 × 13,531.47
4. Step 4: Simplify right side
   18,518.72x = 374,499,061.10
5. Step 5: Solve for x
   x = 374,499,061.10/18,518.72
6. Step 6: Final answer
   x = 20,222.73