Finding the Fourth Proportional to 21,992.62, 30,353.88 and 12,561.18

Step by Step Solution

1. Step 1: Write the proportion equation
   21,992.62 : 30,353.88 = 12,561.18 : x
2. Step 2: Convert to fraction form
   21,992.62/30,353.88 = 12,561.18/x
3. Step 3: Cross multiply
   21,992.62x = 30,353.88 × 12,561.18
4. Step 4: Simplify right side
   21,992.62x = 381,280,550.38
5. Step 5: Solve for x
   x = 381,280,550.38/21,992.62
6. Step 6: Final answer
   x = 17,336.75