Finding the Fourth Proportional to 71,708.23, 98,945.72 and 39,876.31

Step by Step Solution

1. Step 1: Write the proportion equation
   71,708.23 : 98,945.72 = 39,876.31 : x
2. Step 2: Convert to fraction form
   71,708.23/98,945.72 = 39,876.31/x
3. Step 3: Cross multiply
   71,708.23x = 98,945.72 × 39,876.31
4. Step 4: Simplify right side
   71,708.23x = 3,945,590,004.51
5. Step 5: Solve for x
   x = 3,945,590,004.51/71,708.23
6. Step 6: Final answer
   x = 55,022.83