Finding the Fourth Proportional to 139,616.94, 207,846.31 and 138,786.58

Step by Step Solution

1. Step 1: Write the proportion equation
   139,616.94 : 207,846.31 = 138,786.58 : x
2. Step 2: Convert to fraction form
   139,616.94/207,846.31 = 138,786.58/x
3. Step 3: Cross multiply
   139,616.94x = 207,846.31 × 138,786.58
4. Step 4: Simplify right side
   139,616.94x = 28,846,278,530.52
5. Step 5: Solve for x
   x = 28,846,278,530.52/139,616.94
6. Step 6: Final answer
   x = 206,610.16