Finding the Fourth Proportional to 21,383.88, 29,510.68 and 12,185.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,383.88 : 29,510.68 = 12,185.72 : x
2. Step 2: Convert to fraction form
   21,383.88/29,510.68 = 12,185.72/x
3. Step 3: Cross multiply
   21,383.88x = 29,510.68 × 12,185.72
4. Step 4: Simplify right side
   21,383.88x = 359,608,883.49
5. Step 5: Solve for x
   x = 359,608,883.49/21,383.88
6. Step 6: Final answer
   x = 16,816.82