Finding the Fourth Proportional to 138,861.82, 208,249.57 and 50,103.78

Step by Step Solution

1. Step 1: Write the proportion equation
   138,861.82 : 208,249.57 = 50,103.78 : x
2. Step 2: Convert to fraction form
   138,861.82/208,249.57 = 50,103.78/x
3. Step 3: Cross multiply
   138,861.82x = 208,249.57 × 50,103.78
4. Step 4: Simplify right side
   138,861.82x = 10,434,090,640.37
5. Step 5: Solve for x
   x = 10,434,090,640.37/138,861.82
6. Step 6: Final answer
   x = 75,140.10