Finding the Fourth Proportional to 21,493.36, 29,660.72 and 12,061.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,493.36 : 29,660.72 = 12,061.72 : x
2. Step 2: Convert to fraction form
   21,493.36/29,660.72 = 12,061.72/x
3. Step 3: Cross multiply
   21,493.36x = 29,660.72 × 12,061.72
4. Step 4: Simplify right side
   21,493.36x = 357,759,299.64
5. Step 5: Solve for x
   x = 357,759,299.64/21,493.36
6. Step 6: Final answer
   x = 16,645.11