Finding the Fourth Proportional to 21,361.69, 29,474.62 and 12,404.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,361.69 : 29,474.62 = 12,404.56 : x
2. Step 2: Convert to fraction form
   21,361.69/29,474.62 = 12,404.56/x
3. Step 3: Cross multiply
   21,361.69x = 29,474.62 × 12,404.56
4. Step 4: Simplify right side
   21,361.69x = 365,619,692.27
5. Step 5: Solve for x
   x = 365,619,692.27/21,361.69
6. Step 6: Final answer
   x = 17,115.67