Finding the Fourth Proportional to 105.48, 145.59 and 68.70

Step by Step Solution

1. Step 1: Write the proportion equation
   105.48 : 145.59 = 68.70 : x
2. Step 2: Convert to fraction form
   105.48/145.59 = 68.70/x
3. Step 3: Cross multiply
   105.48x = 145.59 × 68.70
4. Step 4: Simplify right side
   105.48x = 10,002.03
5. Step 5: Solve for x
   x = 10,002.03/105.48
6. Step 6: Final answer
   x = 94.82