Finding the Fourth Proportional to 105.72, 145.83 and 68.92

Step by Step Solution

1. Step 1: Write the proportion equation
   105.72 : 145.83 = 68.92 : x
2. Step 2: Convert to fraction form
   105.72/145.83 = 68.92/x
3. Step 3: Cross multiply
   105.72x = 145.83 × 68.92
4. Step 4: Simplify right side
   105.72x = 10,050.60
5. Step 5: Solve for x
   x = 10,050.60/105.72
6. Step 6: Final answer
   x = 95.07