Finding the Fourth Proportional to 111,390.14, 166,910.02 and 86,151.42

Step by Step Solution

1. Step 1: Write the proportion equation
   111,390.14 : 166,910.02 = 86,151.42 : x
2. Step 2: Convert to fraction form
   111,390.14/166,910.02 = 86,151.42/x
3. Step 3: Cross multiply
   111,390.14x = 166,910.02 × 86,151.42
4. Step 4: Simplify right side
   111,390.14x = 14,379,535,019.85
5. Step 5: Solve for x
   x = 14,379,535,019.85/111,390.14
6. Step 6: Final answer
   x = 129,091.63