Finding the Fourth Proportional to 71,789.82, 99,069.94 and 39,958.03

Step by Step Solution

1. Step 1: Write the proportion equation
   71,789.82 : 99,069.94 = 39,958.03 : x
2. Step 2: Convert to fraction form
   71,789.82/99,069.94 = 39,958.03/x
3. Step 3: Cross multiply
   71,789.82x = 99,069.94 × 39,958.03
4. Step 4: Simplify right side
   71,789.82x = 3,958,639,634.62
5. Step 5: Solve for x
   x = 3,958,639,634.62/71,789.82
6. Step 6: Final answer
   x = 55,142.07