Finding the Fourth Proportional to 21,100.96, 29,118.45 and 12,149.38

Step by Step Solution

1. Step 1: Write the proportion equation
   21,100.96 : 29,118.45 = 12,149.38 : x
2. Step 2: Convert to fraction form
   21,100.96/29,118.45 = 12,149.38/x
3. Step 3: Cross multiply
   21,100.96x = 29,118.45 × 12,149.38
4. Step 4: Simplify right side
   21,100.96x = 353,771,114.06
5. Step 5: Solve for x
   x = 353,771,114.06/21,100.96
6. Step 6: Final answer
   x = 16,765.64