Finding the Fourth Proportional to 105.34, 158.06 and 51.18

Step by Step Solution

1. Step 1: Write the proportion equation
   105.34 : 158.06 = 51.18 : x
2. Step 2: Convert to fraction form
   105.34/158.06 = 51.18/x
3. Step 3: Cross multiply
   105.34x = 158.06 × 51.18
4. Step 4: Simplify right side
   105.34x = 8,089.51
5. Step 5: Solve for x
   x = 8,089.51/105.34
6. Step 6: Final answer
   x = 76.79