Finding the Fourth Proportional to 105.52, 158.18 and 51.30

Step by Step Solution

1. Step 1: Write the proportion equation
   105.52 : 158.18 = 51.30 : x
2. Step 2: Convert to fraction form
   105.52/158.18 = 51.30/x
3. Step 3: Cross multiply
   105.52x = 158.18 × 51.30
4. Step 4: Simplify right side
   105.52x = 8,114.63
5. Step 5: Solve for x
   x = 8,114.63/105.52
6. Step 6: Final answer
   x = 76.90