Finding the Fourth Proportional to 111,392.74, 165,931.61 and 105,356.62

Step by Step Solution

1. Step 1: Write the proportion equation
   111,392.74 : 165,931.61 = 105,356.62 : x
2. Step 2: Convert to fraction form
   111,392.74/165,931.61 = 105,356.62/x
3. Step 3: Cross multiply
   111,392.74x = 165,931.61 × 105,356.62
4. Step 4: Simplify right side
   111,392.74x = 17,481,993,580.76
5. Step 5: Solve for x
   x = 17,481,993,580.76/111,392.74
6. Step 6: Final answer
   x = 156,940.15