Finding the Fourth Proportional to 21,710.28, 29,960.07 and 12,150.18

Step by Step Solution

1. Step 1: Write the proportion equation
   21,710.28 : 29,960.07 = 12,150.18 : x
2. Step 2: Convert to fraction form
   21,710.28/29,960.07 = 12,150.18/x
3. Step 3: Cross multiply
   21,710.28x = 29,960.07 × 12,150.18
4. Step 4: Simplify right side
   21,710.28x = 364,020,243.31
5. Step 5: Solve for x
   x = 364,020,243.31/21,710.28
6. Step 6: Final answer
   x = 16,767.18