Finding the Fourth Proportional to 105.34, 156.78 and 104.50

Step by Step Solution

1. Step 1: Write the proportion equation
   105.34 : 156.78 = 104.50 : x
2. Step 2: Convert to fraction form
   105.34/156.78 = 104.50/x
3. Step 3: Cross multiply
   105.34x = 156.78 × 104.50
4. Step 4: Simplify right side
   105.34x = 16,383.51
5. Step 5: Solve for x
   x = 16,383.51/105.34
6. Step 6: Final answer
   x = 155.53