Finding the Fourth Proportional to 21,361.52, 29,478.82 and 12,414.28

Step by Step Solution

1. Step 1: Write the proportion equation
   21,361.52 : 29,478.82 = 12,414.28 : x
2. Step 2: Convert to fraction form
   21,361.52/29,478.82 = 12,414.28/x
3. Step 3: Cross multiply
   21,361.52x = 29,478.82 × 12,414.28
4. Step 4: Simplify right side
   21,361.52x = 365,958,325.55
5. Step 5: Solve for x
   x = 365,958,325.55/21,361.52
6. Step 6: Final answer
   x = 17,131.66