Finding the Fourth Proportional to 21,153.56, 29,185.32 and 12,199.88

Step by Step Solution

1. Step 1: Write the proportion equation
   21,153.56 : 29,185.32 = 12,199.88 : x
2. Step 2: Convert to fraction form
   21,153.56/29,185.32 = 12,199.88/x
3. Step 3: Cross multiply
   21,153.56x = 29,185.32 × 12,199.88
4. Step 4: Simplify right side
   21,153.56x = 356,057,401.76
5. Step 5: Solve for x
   x = 356,057,401.76/21,153.56
6. Step 6: Final answer
   x = 16,832.03