Finding the Fourth Proportional to 111,443.42, 166,006.85 and 105,407.18

Step by Step Solution

1. Step 1: Write the proportion equation
   111,443.42 : 166,006.85 = 105,407.18 : x
2. Step 2: Convert to fraction form
   111,443.42/166,006.85 = 105,407.18/x
3. Step 3: Cross multiply
   111,443.42x = 166,006.85 × 105,407.18
4. Step 4: Simplify right side
   111,443.42x = 17,498,313,919.18
5. Step 5: Solve for x
   x = 17,498,313,919.18/111,443.42
6. Step 6: Final answer
   x = 157,015.23