Finding the Fourth Proportional to 78,049.89, 107,755.25 and 51,239.30

Step by Step Solution

1. Step 1: Write the proportion equation
   78,049.89 : 107,755.25 = 51,239.30 : x
2. Step 2: Convert to fraction form
   78,049.89/107,755.25 = 51,239.30/x
3. Step 3: Cross multiply
   78,049.89x = 107,755.25 × 51,239.30
4. Step 4: Simplify right side
   78,049.89x = 5,521,302,786.35
5. Step 5: Solve for x
   x = 5,521,302,786.35/78,049.89
6. Step 6: Final answer
   x = 70,740.69