Finding the Fourth Proportional to 105.34, 145.34 and 65.94

Step by Step Solution

1. Step 1: Write the proportion equation
   105.34 : 145.34 = 65.94 : x
2. Step 2: Convert to fraction form
   105.34/145.34 = 65.94/x
3. Step 3: Cross multiply
   105.34x = 145.34 × 65.94
4. Step 4: Simplify right side
   105.34x = 9,583.72
5. Step 5: Solve for x
   x = 9,583.72/105.34
6. Step 6: Final answer
   x = 90.98