Finding the Fourth Proportional to 139,186.48, 208,800.18 and 50,419.12

Step by Step Solution

1. Step 1: Write the proportion equation
   139,186.48 : 208,800.18 = 50,419.12 : x
2. Step 2: Convert to fraction form
   139,186.48/208,800.18 = 50,419.12/x
3. Step 3: Cross multiply
   139,186.48x = 208,800.18 × 50,419.12
4. Step 4: Simplify right side
   139,186.48x = 10,527,521,331.44
5. Step 5: Solve for x
   x = 10,527,521,331.44/139,186.48
6. Step 6: Final answer
   x = 75,636.09