Finding the Fourth Proportional to 21,410.82, 29,553.78 and 12,456.60

Step by Step Solution

1. Step 1: Write the proportion equation
   21,410.82 : 29,553.78 = 12,456.60 : x
2. Step 2: Convert to fraction form
   21,410.82/29,553.78 = 12,456.60/x
3. Step 3: Cross multiply
   21,410.82x = 29,553.78 × 12,456.60
4. Step 4: Simplify right side
   21,410.82x = 368,139,615.95
5. Step 5: Solve for x
   x = 368,139,615.95/21,410.82
6. Step 6: Final answer
   x = 17,194.09