Finding the Fourth Proportional to 21,640.15, 29,865.27 and 12,082.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,640.15 : 29,865.27 = 12,082.15 : x
2. Step 2: Convert to fraction form
   21,640.15/29,865.27 = 12,082.15/x
3. Step 3: Cross multiply
   21,640.15x = 29,865.27 × 12,082.15
4. Step 4: Simplify right side
   21,640.15x = 360,836,671.93
5. Step 5: Solve for x
   x = 360,836,671.93/21,640.15
6. Step 6: Final answer
   x = 16,674.41