Finding the Fourth Proportional to 139,580.16, 209,426.22 and 50,839.80

Step by Step Solution

1. Step 1: Write the proportion equation
   139,580.16 : 209,426.22 = 50,839.80 : x
2. Step 2: Convert to fraction form
   139,580.16/209,426.22 = 50,839.80/x
3. Step 3: Cross multiply
   139,580.16x = 209,426.22 × 50,839.80
4. Step 4: Simplify right side
   139,580.16x = 10,647,187,139.56
5. Step 5: Solve for x
   x = 10,647,187,139.56/139,580.16
6. Step 6: Final answer
   x = 76,280.09