Finding the Fourth Proportional to 139,085.39, 208,628.24 and 50,318.10

Step by Step Solution

1. Step 1: Write the proportion equation
   139,085.39 : 208,628.24 = 50,318.10 : x
2. Step 2: Convert to fraction form
   139,085.39/208,628.24 = 50,318.10/x
3. Step 3: Cross multiply
   139,085.39x = 208,628.24 × 50,318.10
4. Step 4: Simplify right side
   139,085.39x = 10,497,776,643.14
5. Step 5: Solve for x
   x = 10,497,776,643.14/139,085.39
6. Step 6: Final answer
   x = 75,477.21