Finding the Fourth Proportional to 105.90, 158.72 and 65.34

Step by Step Solution

1. Step 1: Write the proportion equation
   105.90 : 158.72 = 65.34 : x
2. Step 2: Convert to fraction form
   105.90/158.72 = 65.34/x
3. Step 3: Cross multiply
   105.90x = 158.72 × 65.34
4. Step 4: Simplify right side
   105.90x = 10,370.76
5. Step 5: Solve for x
   x = 10,370.76/105.90
6. Step 6: Final answer
   x = 97.93