Finding the Fourth Proportional to 259,336.91, 388,991.59 and 79,422.28

Step by Step Solution

1. Step 1: Write the proportion equation
   259,336.91 : 388,991.59 = 79,422.28 : x
2. Step 2: Convert to fraction form
   259,336.91/388,991.59 = 79,422.28/x
3. Step 3: Cross multiply
   259,336.91x = 388,991.59 × 79,422.28
4. Step 4: Simplify right side
   259,336.91x = 30,894,598,978.63
5. Step 5: Solve for x
   x = 30,894,598,978.63/259,336.91
6. Step 6: Final answer
   x = 119,129.20