Finding the Fourth Proportional to 12,661.02, 17,472.78 and 7,072.02

Step by Step Solution

1. Step 1: Write the proportion equation
   12,661.02 : 17,472.78 = 7,072.02 : x
2. Step 2: Convert to fraction form
   12,661.02/17,472.78 = 7,072.02/x
3. Step 3: Cross multiply
   12,661.02x = 17,472.78 × 7,072.02
4. Step 4: Simplify right side
   12,661.02x = 123,567,849.62
5. Step 5: Solve for x
   x = 123,567,849.62/12,661.02
6. Step 6: Final answer
   x = 9,759.71