Finding the Fourth Proportional to 21,429.78, 29,571.57 and 12,476.94

Step by Step Solution

1. Step 1: Write the proportion equation
   21,429.78 : 29,571.57 = 12,476.94 : x
2. Step 2: Convert to fraction form
   21,429.78/29,571.57 = 12,476.94/x
3. Step 3: Cross multiply
   21,429.78x = 29,571.57 × 12,476.94
4. Step 4: Simplify right side
   21,429.78x = 368,962,704.60
5. Step 5: Solve for x
   x = 368,962,704.60/21,429.78
6. Step 6: Final answer
   x = 17,217.29