Finding the Fourth Proportional to 139,186.53, 208,800.35 and 50,419.38

Step by Step Solution

1. Step 1: Write the proportion equation
   139,186.53 : 208,800.35 = 50,419.38 : x
2. Step 2: Convert to fraction form
   139,186.53/208,800.35 = 50,419.38/x
3. Step 3: Cross multiply
   139,186.53x = 208,800.35 × 50,419.38
4. Step 4: Simplify right side
   139,186.53x = 10,527,583,938.69
5. Step 5: Solve for x
   x = 10,527,583,938.69/139,186.53
6. Step 6: Final answer
   x = 75,636.51