Finding the Fourth Proportional to 138,981.78, 208,476.71 and 50,219.55

Step by Step Solution

1. Step 1: Write the proportion equation
   138,981.78 : 208,476.71 = 50,219.55 : x
2. Step 2: Convert to fraction form
   138,981.78/208,476.71 = 50,219.55/x
3. Step 3: Cross multiply
   138,981.78x = 208,476.71 × 50,219.55
4. Step 4: Simplify right side
   138,981.78x = 10,469,605,644.85
5. Step 5: Solve for x
   x = 10,469,605,644.85/138,981.78
6. Step 6: Final answer
   x = 75,330.78