Finding the Fourth Proportional to 21,093.67, 29,112.04 and 12,139.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,093.67 : 29,112.04 = 12,139.48 : x
2. Step 2: Convert to fraction form
   21,093.67/29,112.04 = 12,139.48/x
3. Step 3: Cross multiply
   21,093.67x = 29,112.04 × 12,139.48
4. Step 4: Simplify right side
   21,093.67x = 353,405,027.34
5. Step 5: Solve for x
   x = 353,405,027.34/21,093.67
6. Step 6: Final answer
   x = 16,754.08