Finding the Fourth Proportional to 71,791.32, 99,072.01 and 39,959.53

Step by Step Solution

1. Step 1: Write the proportion equation
   71,791.32 : 99,072.01 = 39,959.53 : x
2. Step 2: Convert to fraction form
   71,791.32/99,072.01 = 39,959.53/x
3. Step 3: Cross multiply
   71,791.32x = 99,072.01 × 39,959.53
4. Step 4: Simplify right side
   71,791.32x = 3,958,870,955.76
5. Step 5: Solve for x
   x = 3,958,870,955.76/71,791.32
6. Step 6: Final answer
   x = 55,144.14