Finding the Fourth Proportional to 21,747.12, 32,607.52 and 11,872.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,747.12 : 32,607.52 = 11,872.72 : x
2. Step 2: Convert to fraction form
   21,747.12/32,607.52 = 11,872.72/x
3. Step 3: Cross multiply
   21,747.12x = 32,607.52 × 11,872.72
4. Step 4: Simplify right side
   21,747.12x = 387,139,954.85
5. Step 5: Solve for x
   x = 387,139,954.85/21,747.12
6. Step 6: Final answer
   x = 17,801.90