Finding the Fourth Proportional to 105.29, 158.00 and 51.18

Step by Step Solution

1. Step 1: Write the proportion equation
   105.29 : 158.00 = 51.18 : x
2. Step 2: Convert to fraction form
   105.29/158.00 = 51.18/x
3. Step 3: Cross multiply
   105.29x = 158.00 × 51.18
4. Step 4: Simplify right side
   105.29x = 8,086.18
5. Step 5: Solve for x
   x = 8,086.18/105.29
6. Step 6: Final answer
   x = 76.80