Finding the Fourth Proportional to 105.37, 145.18 and 70.81

Step by Step Solution

1. Step 1: Write the proportion equation
   105.37 : 145.18 = 70.81 : x
2. Step 2: Convert to fraction form
   105.37/145.18 = 70.81/x
3. Step 3: Cross multiply
   105.37x = 145.18 × 70.81
4. Step 4: Simplify right side
   105.37x = 10,280.20
5. Step 5: Solve for x
   x = 10,280.20/105.37
6. Step 6: Final answer
   x = 97.56