Finding the Fourth Proportional to 139,687.86, 209,564.32 and 39,849.42

Step by Step Solution

1. Step 1: Write the proportion equation
   139,687.86 : 209,564.32 = 39,849.42 : x
2. Step 2: Convert to fraction form
   139,687.86/209,564.32 = 39,849.42/x
3. Step 3: Cross multiply
   139,687.86x = 209,564.32 × 39,849.42
4. Step 4: Simplify right side
   139,687.86x = 8,351,016,604.69
5. Step 5: Solve for x
   x = 8,351,016,604.69/139,687.86
6. Step 6: Final answer
   x = 59,783.41