Finding the Fourth Proportional to 21,420.27, 29,557.17 and 12,469.37

Step by Step Solution

1. Step 1: Write the proportion equation
   21,420.27 : 29,557.17 = 12,469.37 : x
2. Step 2: Convert to fraction form
   21,420.27/29,557.17 = 12,469.37/x
3. Step 3: Cross multiply
   21,420.27x = 29,557.17 × 12,469.37
4. Step 4: Simplify right side
   21,420.27x = 368,559,141.10
5. Step 5: Solve for x
   x = 368,559,141.10/21,420.27
6. Step 6: Final answer
   x = 17,206.09