Finding the Fourth Proportional to 105.72, 145.88 and 68.84

Step by Step Solution

1. Step 1: Write the proportion equation
   105.72 : 145.88 = 68.84 : x
2. Step 2: Convert to fraction form
   105.72/145.88 = 68.84/x
3. Step 3: Cross multiply
   105.72x = 145.88 × 68.84
4. Step 4: Simplify right side
   105.72x = 10,042.38
5. Step 5: Solve for x
   x = 10,042.38/105.72
6. Step 6: Final answer
   x = 94.99