Finding the Fourth Proportional to 17,145, 23,669.82 and 12,945.96

Step by Step Solution

1. Step 1: Write the proportion equation
   17,145 : 23,669.82 = 12,945.96 : x
2. Step 2: Convert to fraction form
   17,145/23,669.82 = 12,945.96/x
3. Step 3: Cross multiply
   17,145x = 23,669.82 × 12,945.96
4. Step 4: Simplify right side
   17,145x = 306,428,542.93
5. Step 5: Solve for x
   x = 306,428,542.93/17,145
6. Step 6: Final answer
   x = 17,872.76