Finding the Fourth Proportional to 138,942.72, 208,371.52 and 50,185.28

Step by Step Solution

1. Step 1: Write the proportion equation
   138,942.72 : 208,371.52 = 50,185.28 : x
2. Step 2: Convert to fraction form
   138,942.72/208,371.52 = 50,185.28/x
3. Step 3: Cross multiply
   138,942.72x = 208,371.52 × 50,185.28
4. Step 4: Simplify right side
   138,942.72x = 10,457,183,075.23
5. Step 5: Solve for x
   x = 10,457,183,075.23/138,942.72
6. Step 6: Final answer
   x = 75,262.55