Finding the Fourth Proportional to 20,083.94, 27,715.83 and 12,128.12

Step by Step Solution

1. Step 1: Write the proportion equation
   20,083.94 : 27,715.83 = 12,128.12 : x
2. Step 2: Convert to fraction form
   20,083.94/27,715.83 = 12,128.12/x
3. Step 3: Cross multiply
   20,083.94x = 27,715.83 × 12,128.12
4. Step 4: Simplify right side
   20,083.94x = 336,140,912.14
5. Step 5: Solve for x
   x = 336,140,912.14/20,083.94
6. Step 6: Final answer
   x = 16,736.80