Finding the Fourth Proportional to 21,178.56, 29,222.37 and 12,106.79

Step by Step Solution

1. Step 1: Write the proportion equation
   21,178.56 : 29,222.37 = 12,106.79 : x
2. Step 2: Convert to fraction form
   21,178.56/29,222.37 = 12,106.79/x
3. Step 3: Cross multiply
   21,178.56x = 29,222.37 × 12,106.79
4. Step 4: Simplify right side
   21,178.56x = 353,789,096.89
5. Step 5: Solve for x
   x = 353,789,096.89/21,178.56
6. Step 6: Final answer
   x = 16,705.06