Finding the Fourth Proportional to 21,090.72, 29,104.29 and 12,132.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,090.72 : 29,104.29 = 12,132.12 : x
2. Step 2: Convert to fraction form
   21,090.72/29,104.29 = 12,132.12/x
3. Step 3: Cross multiply
   21,090.72x = 29,104.29 × 12,132.12
4. Step 4: Simplify right side
   21,090.72x = 353,096,738.79
5. Step 5: Solve for x
   x = 353,096,738.79/21,090.72
6. Step 6: Final answer
   x = 16,741.81