Finding the Fourth Proportional to 139,007.98, 206,723.69 and 134,579.30

Step by Step Solution

1. Step 1: Write the proportion equation
   139,007.98 : 206,723.69 = 134,579.30 : x
2. Step 2: Convert to fraction form
   139,007.98/206,723.69 = 134,579.30/x
3. Step 3: Cross multiply
   139,007.98x = 206,723.69 × 134,579.30
4. Step 4: Simplify right side
   139,007.98x = 27,820,729,493.62
5. Step 5: Solve for x
   x = 27,820,729,493.62/139,007.98
6. Step 6: Final answer
   x = 200,137.64