Finding the Fourth Proportional to 139,021.36, 208,548.25 and 50,316.64

Step by Step Solution

1. Step 1: Write the proportion equation
   139,021.36 : 208,548.25 = 50,316.64 : x
2. Step 2: Convert to fraction form
   139,021.36/208,548.25 = 50,316.64/x
3. Step 3: Cross multiply
   139,021.36x = 208,548.25 × 50,316.64
4. Step 4: Simplify right side
   139,021.36x = 10,493,446,570.72
5. Step 5: Solve for x
   x = 10,493,446,570.72/139,021.36
6. Step 6: Final answer
   x = 75,480.82