Finding the Fourth Proportional to 139,878.37, 209,859.32 and 131,523.49

Step by Step Solution

1. Step 1: Write the proportion equation
   139,878.37 : 209,859.32 = 131,523.49 : x
2. Step 2: Convert to fraction form
   139,878.37/209,859.32 = 131,523.49/x
3. Step 3: Cross multiply
   139,878.37x = 209,859.32 × 131,523.49
4. Step 4: Simplify right side
   139,878.37x = 27,601,428,993.16
5. Step 5: Solve for x
   x = 27,601,428,993.16/139,878.37
6. Step 6: Final answer
   x = 197,324.50