Finding the Fourth Proportional to 21,839.79, 30,141.42 and 12,150.21

Step by Step Solution

1. Step 1: Write the proportion equation
   21,839.79 : 30,141.42 = 12,150.21 : x
2. Step 2: Convert to fraction form
   21,839.79/30,141.42 = 12,150.21/x
3. Step 3: Cross multiply
   21,839.79x = 30,141.42 × 12,150.21
4. Step 4: Simplify right side
   21,839.79x = 366,224,582.70
5. Step 5: Solve for x
   x = 366,224,582.70/21,839.79
6. Step 6: Final answer
   x = 16,768.69