Finding the Fourth Proportional to 111,391.74, 165,930.12 and 105,355.62

Step by Step Solution

1. Step 1: Write the proportion equation
   111,391.74 : 165,930.12 = 105,355.62 : x
2. Step 2: Convert to fraction form
   111,391.74/165,930.12 = 105,355.62/x
3. Step 3: Cross multiply
   111,391.74x = 165,930.12 × 105,355.62
4. Step 4: Simplify right side
   111,391.74x = 17,481,670,669.27
5. Step 5: Solve for x
   x = 17,481,670,669.27/111,391.74
6. Step 6: Final answer
   x = 156,938.66