Finding the Fourth Proportional to 105.60, 145.72 and 68.76

Step by Step Solution

1. Step 1: Write the proportion equation
   105.60 : 145.72 = 68.76 : x
2. Step 2: Convert to fraction form
   105.60/145.72 = 68.76/x
3. Step 3: Cross multiply
   105.60x = 145.72 × 68.76
4. Step 4: Simplify right side
   105.60x = 10,019.71
5. Step 5: Solve for x
   x = 10,019.71/105.60
6. Step 6: Final answer
   x = 94.88