Finding the Fourth Proportional to 120,367.89, 166,185.41 and 77,366.61

Step by Step Solution

1. Step 1: Write the proportion equation
   120,367.89 : 166,185.41 = 77,366.61 : x
2. Step 2: Convert to fraction form
   120,367.89/166,185.41 = 77,366.61/x
3. Step 3: Cross multiply
   120,367.89x = 166,185.41 × 77,366.61
4. Step 4: Simplify right side
   120,367.89x = 12,857,201,416.33
5. Step 5: Solve for x
   x = 12,857,201,416.33/120,367.89
6. Step 6: Final answer
   x = 106,815.87