Finding the Fourth Proportional to 21,942, 30,280.72 and 12,006

Step by Step Solution

1. Step 1: Write the proportion equation
   21,942 : 30,280.72 = 12,006 : x
2. Step 2: Convert to fraction form
   21,942/30,280.72 = 12,006/x
3. Step 3: Cross multiply
   21,942x = 30,280.72 × 12,006
4. Step 4: Simplify right side
   21,942x = 363,550,324.32
5. Step 5: Solve for x
   x = 363,550,324.32/21,942
6. Step 6: Final answer
   x = 16,568.70