Finding the Fourth Proportional to 21,961.16, 30,306.91 and 12,404.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,961.16 : 30,306.91 = 12,404.12 : x
2. Step 2: Convert to fraction form
   21,961.16/30,306.91 = 12,404.12/x
3. Step 3: Cross multiply
   21,961.16x = 30,306.91 × 12,404.12
4. Step 4: Simplify right side
   21,961.16x = 375,930,559.66
5. Step 5: Solve for x
   x = 375,930,559.66/21,961.16
6. Step 6: Final answer
   x = 17,117.97