Finding the Fourth Proportional to 21,131.82, 29,153.34 and 12,174.54

Step by Step Solution

1. Step 1: Write the proportion equation
   21,131.82 : 29,153.34 = 12,174.54 : x
2. Step 2: Convert to fraction form
   21,131.82/29,153.34 = 12,174.54/x
3. Step 3: Cross multiply
   21,131.82x = 29,153.34 × 12,174.54
4. Step 4: Simplify right side
   21,131.82x = 354,928,503.96
5. Step 5: Solve for x
   x = 354,928,503.96/21,131.82
6. Step 6: Final answer
   x = 16,795.93