Finding the Fourth Proportional to 21,034.25, 29,025.16 and 12,419.09

Step by Step Solution

1. Step 1: Write the proportion equation
   21,034.25 : 29,025.16 = 12,419.09 : x
2. Step 2: Convert to fraction form
   21,034.25/29,025.16 = 12,419.09/x
3. Step 3: Cross multiply
   21,034.25x = 29,025.16 × 12,419.09
4. Step 4: Simplify right side
   21,034.25x = 360,466,074.30
5. Step 5: Solve for x
   x = 360,466,074.30/21,034.25
6. Step 6: Final answer
   x = 17,137.10