Finding the Fourth Proportional to 71,791.82, 99,072.70 and 39,960.04

Step by Step Solution

1. Step 1: Write the proportion equation
   71,791.82 : 99,072.70 = 39,960.04 : x
2. Step 2: Convert to fraction form
   71,791.82/99,072.70 = 39,960.04/x
3. Step 3: Cross multiply
   71,791.82x = 99,072.70 × 39,960.04
4. Step 4: Simplify right side
   71,791.82x = 3,958,949,054.91
5. Step 5: Solve for x
   x = 3,958,949,054.91/71,791.82
6. Step 6: Final answer
   x = 55,144.85