Finding the Fourth Proportional to 120,629.88, 166,399.59 and 75,229.05

Step by Step Solution

1. Step 1: Write the proportion equation
   120,629.88 : 166,399.59 = 75,229.05 : x
2. Step 2: Convert to fraction form
   120,629.88/166,399.59 = 75,229.05/x
3. Step 3: Cross multiply
   120,629.88x = 166,399.59 × 75,229.05
4. Step 4: Simplify right side
   120,629.88x = 12,518,083,076.09
5. Step 5: Solve for x
   x = 12,518,083,076.09/120,629.88
6. Step 6: Final answer
   x = 103,772.66