Finding the Fourth Proportional to 139,724.08, 208,942.31 and 103,768.43

Step by Step Solution

1. Step 1: Write the proportion equation
   139,724.08 : 208,942.31 = 103,768.43 : x
2. Step 2: Convert to fraction form
   139,724.08/208,942.31 = 103,768.43/x
3. Step 3: Cross multiply
   139,724.08x = 208,942.31 × 103,768.43
4. Step 4: Simplify right side
   139,724.08x = 21,681,615,469.27
5. Step 5: Solve for x
   x = 21,681,615,469.27/139,724.08
6. Step 6: Final answer
   x = 155,174.51