Finding the Fourth Proportional to 255,729.72, 383,609.94 and 78,238.28

Step by Step Solution

1. Step 1: Write the proportion equation
   255,729.72 : 383,609.94 = 78,238.28 : x
2. Step 2: Convert to fraction form
   255,729.72/383,609.94 = 78,238.28/x
3. Step 3: Cross multiply
   255,729.72x = 383,609.94 × 78,238.28
4. Step 4: Simplify right side
   255,729.72x = 30,012,979,978.45
5. Step 5: Solve for x
   x = 30,012,979,978.45/255,729.72
6. Step 6: Final answer
   x = 117,362.11