Finding the Fourth Proportional to 21,834.69, 30,128.49 and 12,272.80

Step by Step Solution

1. Step 1: Write the proportion equation
   21,834.69 : 30,128.49 = 12,272.80 : x
2. Step 2: Convert to fraction form
   21,834.69/30,128.49 = 12,272.80/x
3. Step 3: Cross multiply
   21,834.69x = 30,128.49 × 12,272.80
4. Step 4: Simplify right side
   21,834.69x = 369,761,092.12
5. Step 5: Solve for x
   x = 369,761,092.12/21,834.69
6. Step 6: Final answer
   x = 16,934.57