Finding the Fourth Proportional to 21,354.53, 29,469.15 and 12,407.27

Step by Step Solution

1. Step 1: Write the proportion equation
   21,354.53 : 29,469.15 = 12,407.27 : x
2. Step 2: Convert to fraction form
   21,354.53/29,469.15 = 12,407.27/x
3. Step 3: Cross multiply
   21,354.53x = 29,469.15 × 12,407.27
4. Step 4: Simplify right side
   21,354.53x = 365,631,553.37
5. Step 5: Solve for x
   x = 365,631,553.37/21,354.53
6. Step 6: Final answer
   x = 17,121.97