Finding the Fourth Proportional to 21,150.72, 29,185.92 and 12,199.68

Step by Step Solution

1. Step 1: Write the proportion equation
   21,150.72 : 29,185.92 = 12,199.68 : x
2. Step 2: Convert to fraction form
   21,150.72/29,185.92 = 12,199.68/x
3. Step 3: Cross multiply
   21,150.72x = 29,185.92 × 12,199.68
4. Step 4: Simplify right side
   21,150.72x = 356,058,884.51
5. Step 5: Solve for x
   x = 356,058,884.51/21,150.72
6. Step 6: Final answer
   x = 16,834.36