Finding the Fourth Proportional to 139,054.94, 208,458.70 and 50,288.71

Step by Step Solution

1. Step 1: Write the proportion equation
   139,054.94 : 208,458.70 = 50,288.71 : x
2. Step 2: Convert to fraction form
   139,054.94/208,458.70 = 50,288.71/x
3. Step 3: Cross multiply
   139,054.94x = 208,458.70 × 50,288.71
4. Step 4: Simplify right side
   139,054.94x = 10,483,119,111.28
5. Step 5: Solve for x
   x = 10,483,119,111.28/139,054.94
6. Step 6: Final answer
   x = 75,388.33