Finding the Fourth Proportional to 139,435.66, 209,061.02 and 50,678.62

Step by Step Solution

1. Step 1: Write the proportion equation
   139,435.66 : 209,061.02 = 50,678.62 : x
2. Step 2: Convert to fraction form
   139,435.66/209,061.02 = 50,678.62/x
3. Step 3: Cross multiply
   139,435.66x = 209,061.02 × 50,678.62
4. Step 4: Simplify right side
   139,435.66x = 10,594,923,989.39
5. Step 5: Solve for x
   x = 10,594,923,989.39/139,435.66
6. Step 6: Final answer
   x = 75,984.32