Finding the Fourth Proportional to 85,855.97, 128,152.34 and 79,839.29

Step by Step Solution

1. Step 1: Write the proportion equation
   85,855.97 : 128,152.34 = 79,839.29 : x
2. Step 2: Convert to fraction form
   85,855.97/128,152.34 = 79,839.29/x
3. Step 3: Cross multiply
   85,855.97x = 128,152.34 × 79,839.29
4. Step 4: Simplify right side
   85,855.97x = 10,231,590,797.48
5. Step 5: Solve for x
   x = 10,231,590,797.48/85,855.97
6. Step 6: Final answer
   x = 119,171.58