Finding the Fourth Proportional to 111,443.92, 166,007.60 and 105,407.68

Step by Step Solution

1. Step 1: Write the proportion equation
   111,443.92 : 166,007.60 = 105,407.68 : x
2. Step 2: Convert to fraction form
   111,443.92/166,007.60 = 105,407.68/x
3. Step 3: Cross multiply
   111,443.92x = 166,007.60 × 105,407.68
4. Step 4: Simplify right side
   111,443.92x = 17,498,475,978.37
5. Step 5: Solve for x
   x = 17,498,475,978.37/111,443.92
6. Step 6: Final answer
   x = 157,015.98