Finding the Fourth Proportional to 71,561.02, 98,736.42 and 39,721.96

Step by Step Solution

1. Step 1: Write the proportion equation
   71,561.02 : 98,736.42 = 39,721.96 : x
2. Step 2: Convert to fraction form
   71,561.02/98,736.42 = 39,721.96/x
3. Step 3: Cross multiply
   71,561.02x = 98,736.42 × 39,721.96
4. Step 4: Simplify right side
   71,561.02x = 3,922,004,125.78
5. Step 5: Solve for x
   x = 3,922,004,125.78/71,561.02
6. Step 6: Final answer
   x = 54,806.43