Finding the Fourth Proportional to 105.61, 145.69 and 68.77

Step by Step Solution

1. Step 1: Write the proportion equation
   105.61 : 145.69 = 68.77 : x
2. Step 2: Convert to fraction form
   105.61/145.69 = 68.77/x
3. Step 3: Cross multiply
   105.61x = 145.69 × 68.77
4. Step 4: Simplify right side
   105.61x = 10,019.37
5. Step 5: Solve for x
   x = 10,019.37/105.61
6. Step 6: Final answer
   x = 94.87