Finding the Fourth Proportional to 19,721.41, 27,215.33 and 12,164.72

Step by Step Solution

1. Step 1: Write the proportion equation
   19,721.41 : 27,215.33 = 12,164.72 : x
2. Step 2: Convert to fraction form
   19,721.41/27,215.33 = 12,164.72/x
3. Step 3: Cross multiply
   19,721.41x = 27,215.33 × 12,164.72
4. Step 4: Simplify right side
   19,721.41x = 331,066,672.26
5. Step 5: Solve for x
   x = 331,066,672.26/19,721.41
6. Step 6: Final answer
   x = 16,787.17