Finding the Fourth Proportional to 139,357.72, 209,119.68 and 50,618.20

Step by Step Solution

1. Step 1: Write the proportion equation
   139,357.72 : 209,119.68 = 50,618.20 : x
2. Step 2: Convert to fraction form
   139,357.72/209,119.68 = 50,618.20/x
3. Step 3: Cross multiply
   139,357.72x = 209,119.68 × 50,618.20
4. Step 4: Simplify right side
   139,357.72x = 10,585,261,786.18
5. Step 5: Solve for x
   x = 10,585,261,786.18/139,357.72
6. Step 6: Final answer
   x = 75,957.48