Finding the Fourth Proportional to 21,072.76, 29,083.32 and 12,120.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,072.76 : 29,083.32 = 12,120.10 : x
2. Step 2: Convert to fraction form
   21,072.76/29,083.32 = 12,120.10/x
3. Step 3: Cross multiply
   21,072.76x = 29,083.32 × 12,120.10
4. Step 4: Simplify right side
   21,072.76x = 352,492,674.02
5. Step 5: Solve for x
   x = 352,492,674.02/21,072.76
6. Step 6: Final answer
   x = 16,727.41