Finding the Fourth Proportional to 139,249.72, 208,809.78 and 50,499.64

Step by Step Solution

1. Step 1: Write the proportion equation
   139,249.72 : 208,809.78 = 50,499.64 : x
2. Step 2: Convert to fraction form
   139,249.72/208,809.78 = 50,499.64/x
3. Step 3: Cross multiply
   139,249.72x = 208,809.78 × 50,499.64
4. Step 4: Simplify right side
   139,249.72x = 10,544,818,718.48
5. Step 5: Solve for x
   x = 10,544,818,718.48/139,249.72
6. Step 6: Final answer
   x = 75,725.96