Finding the Fourth Proportional to 139,571.82, 209,190.95 and 50,721.30

Step by Step Solution

1. Step 1: Write the proportion equation
   139,571.82 : 209,190.95 = 50,721.30 : x
2. Step 2: Convert to fraction form
   139,571.82/209,190.95 = 50,721.30/x
3. Step 3: Cross multiply
   139,571.82x = 209,190.95 × 50,721.30
4. Step 4: Simplify right side
   139,571.82x = 10,610,436,678.63
5. Step 5: Solve for x
   x = 10,610,436,678.63/139,571.82
6. Step 6: Final answer
   x = 76,021.34