Finding the Fourth Proportional to 120,782.72, 181,078.80 and 76,315.76

Step by Step Solution

1. Step 1: Write the proportion equation
   120,782.72 : 181,078.80 = 76,315.76 : x
2. Step 2: Convert to fraction form
   120,782.72/181,078.80 = 76,315.76/x
3. Step 3: Cross multiply
   120,782.72x = 181,078.80 × 76,315.76
4. Step 4: Simplify right side
   120,782.72x = 13,819,166,241.89
5. Step 5: Solve for x
   x = 13,819,166,241.89/120,782.72
6. Step 6: Final answer
   x = 114,413.44