Finding the Fourth Proportional to 71,766.69, 99,036.72 and 39,935.31

Step by Step Solution

1. Step 1: Write the proportion equation
   71,766.69 : 99,036.72 = 39,935.31 : x
2. Step 2: Convert to fraction form
   71,766.69/99,036.72 = 39,935.31/x
3. Step 3: Cross multiply
   71,766.69x = 99,036.72 × 39,935.31
4. Step 4: Simplify right side
   71,766.69x = 3,955,062,114.58
5. Step 5: Solve for x
   x = 3,955,062,114.58/71,766.69
6. Step 6: Final answer
   x = 55,110.00