Finding the Fourth Proportional to 12,661.72, 17,467.90 and 7,623.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,661.72 : 17,467.90 = 7,623.42 : x
2. Step 2: Convert to fraction form
   12,661.72/17,467.90 = 7,623.42/x
3. Step 3: Cross multiply
   12,661.72x = 17,467.90 × 7,623.42
4. Step 4: Simplify right side
   12,661.72x = 133,165,096.54
5. Step 5: Solve for x
   x = 133,165,096.54/12,661.72
6. Step 6: Final answer
   x = 10,517.14