Finding the Fourth Proportional to 21,072, 29,081.92 and 12,240

Step by Step Solution

1. Step 1: Write the proportion equation
   21,072 : 29,081.92 = 12,240 : x
2. Step 2: Convert to fraction form
   21,072/29,081.92 = 12,240/x
3. Step 3: Cross multiply
   21,072x = 29,081.92 × 12,240
4. Step 4: Simplify right side
   21,072x = 355,962,700.80
5. Step 5: Solve for x
   x = 355,962,700.80/21,072
6. Step 6: Final answer
   x = 16,892.69