Finding the Fourth Proportional to 21,936, 30,271.80 and 12,000

Step by Step Solution

1. Step 1: Write the proportion equation
   21,936 : 30,271.80 = 12,000 : x
2. Step 2: Convert to fraction form
   21,936/30,271.80 = 12,000/x
3. Step 3: Cross multiply
   21,936x = 30,271.80 × 12,000
4. Step 4: Simplify right side
   21,936x = 363,261,600
5. Step 5: Solve for x
   x = 363,261,600/21,936
6. Step 6: Final answer
   x = 16,560.07