Finding the Fourth Proportional to 139,571.07, 209,189.82 and 50,720.55

Step by Step Solution

1. Step 1: Write the proportion equation
   139,571.07 : 209,189.82 = 50,720.55 : x
2. Step 2: Convert to fraction form
   139,571.07/209,189.82 = 50,720.55/x
3. Step 3: Cross multiply
   139,571.07x = 209,189.82 × 50,720.55
4. Step 4: Simplify right side
   139,571.07x = 10,610,222,724.80
5. Step 5: Solve for x
   x = 10,610,222,724.80/139,571.07
6. Step 6: Final answer
   x = 76,020.21