Finding the Fourth Proportional to 12,072.72, 16,662.42 and 7,039.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,072.72 : 16,662.42 = 7,039.89 : x
2. Step 2: Convert to fraction form
   12,072.72/16,662.42 = 7,039.89/x
3. Step 3: Cross multiply
   12,072.72x = 16,662.42 × 7,039.89
4. Step 4: Simplify right side
   12,072.72x = 117,301,603.93
5. Step 5: Solve for x
   x = 117,301,603.93/12,072.72
6. Step 6: Final answer
   x = 9,716.25