Finding the Fourth Proportional to 139,885.47, 209,786.49 and 51,118.38

Step by Step Solution

1. Step 1: Write the proportion equation
   139,885.47 : 209,786.49 = 51,118.38 : x
2. Step 2: Convert to fraction form
   139,885.47/209,786.49 = 51,118.38/x
3. Step 3: Cross multiply
   139,885.47x = 209,786.49 × 51,118.38
4. Step 4: Simplify right side
   139,885.47x = 10,723,945,514.69
5. Step 5: Solve for x
   x = 10,723,945,514.69/139,885.47
6. Step 6: Final answer
   x = 76,662.33