Finding the Fourth Proportional to 21,850.72, 30,154 and 12,419.04

Step by Step Solution

1. Step 1: Write the proportion equation
   21,850.72 : 30,154 = 12,419.04 : x
2. Step 2: Convert to fraction form
   21,850.72/30,154 = 12,419.04/x
3. Step 3: Cross multiply
   21,850.72x = 30,154 × 12,419.04
4. Step 4: Simplify right side
   21,850.72x = 374,483,732.16
5. Step 5: Solve for x
   x = 374,483,732.16/21,850.72
6. Step 6: Final answer
   x = 17,138.28