Finding the Fourth Proportional to 21,105.12, 29,128.59 and 12,150.93

Step by Step Solution

1. Step 1: Write the proportion equation
   21,105.12 : 29,128.59 = 12,150.93 : x
2. Step 2: Convert to fraction form
   21,105.12/29,128.59 = 12,150.93/x
3. Step 3: Cross multiply
   21,105.12x = 29,128.59 × 12,150.93
4. Step 4: Simplify right side
   21,105.12x = 353,939,458.09
5. Step 5: Solve for x
   x = 353,939,458.09/21,105.12
6. Step 6: Final answer
   x = 16,770.31