Finding the Fourth Proportional to 139,308.30, 209,052.09 and 50,553.90

Step by Step Solution

1. Step 1: Write the proportion equation
   139,308.30 : 209,052.09 = 50,553.90 : x
2. Step 2: Convert to fraction form
   139,308.30/209,052.09 = 50,553.90/x
3. Step 3: Cross multiply
   139,308.30x = 209,052.09 × 50,553.90
4. Step 4: Simplify right side
   139,308.30x = 10,568,398,452.65
5. Step 5: Solve for x
   x = 10,568,398,452.65/139,308.30
6. Step 6: Final answer
   x = 75,863.38