Finding the Fourth Proportional to 111.69, 153.83 and 102.92

Step by Step Solution

1. Step 1: Write the proportion equation
   111.69 : 153.83 = 102.92 : x
2. Step 2: Convert to fraction form
   111.69/153.83 = 102.92/x
3. Step 3: Cross multiply
   111.69x = 153.83 × 102.92
4. Step 4: Simplify right side
   111.69x = 15,831.67
5. Step 5: Solve for x
   x = 15,831.67/111.69
6. Step 6: Final answer
   x = 141.75