Finding the Fourth Proportional to 21,851.72, 30,146.82 and 13,453.64

Step by Step Solution

1. Step 1: Write the proportion equation
   21,851.72 : 30,146.82 = 13,453.64 : x
2. Step 2: Convert to fraction form
   21,851.72/30,146.82 = 13,453.64/x
3. Step 3: Cross multiply
   21,851.72x = 30,146.82 × 13,453.64
4. Step 4: Simplify right side
   21,851.72x = 405,584,463.42
5. Step 5: Solve for x
   x = 405,584,463.42/21,851.72
6. Step 6: Final answer
   x = 18,560.76