Finding the Fourth Proportional to 21,910.50, 30,236.49 and 12,479.94

Step by Step Solution

1. Step 1: Write the proportion equation
   21,910.50 : 30,236.49 = 12,479.94 : x
2. Step 2: Convert to fraction form
   21,910.50/30,236.49 = 12,479.94/x
3. Step 3: Cross multiply
   21,910.50x = 30,236.49 × 12,479.94
4. Step 4: Simplify right side
   21,910.50x = 377,349,581.01
5. Step 5: Solve for x
   x = 377,349,581.01/21,910.50
6. Step 6: Final answer
   x = 17,222.32