Finding the Fourth Proportional to 139,447.78, 208,654.89 and 83,318.43

Step by Step Solution

1. Step 1: Write the proportion equation
   139,447.78 : 208,654.89 = 83,318.43 : x
2. Step 2: Convert to fraction form
   139,447.78/208,654.89 = 83,318.43/x
3. Step 3: Cross multiply
   139,447.78x = 208,654.89 × 83,318.43
4. Step 4: Simplify right side
   139,447.78x = 17,384,797,846.62
5. Step 5: Solve for x
   x = 17,384,797,846.62/139,447.78
6. Step 6: Final answer
   x = 124,668.87