Finding the Fourth Proportional to 21,666.56, 29,899.29 and 12,105.86

Step by Step Solution

1. Step 1: Write the proportion equation
   21,666.56 : 29,899.29 = 12,105.86 : x
2. Step 2: Convert to fraction form
   21,666.56/29,899.29 = 12,105.86/x
3. Step 3: Cross multiply
   21,666.56x = 29,899.29 × 12,105.86
4. Step 4: Simplify right side
   21,666.56x = 361,956,469.34
5. Step 5: Solve for x
   x = 361,956,469.34/21,666.56
6. Step 6: Final answer
   x = 16,705.77