Finding the Fourth Proportional to 105.15, 144.72 and 75.99

Step by Step Solution

1. Step 1: Write the proportion equation
   105.15 : 144.72 = 75.99 : x
2. Step 2: Convert to fraction form
   105.15/144.72 = 75.99/x
3. Step 3: Cross multiply
   105.15x = 144.72 × 75.99
4. Step 4: Simplify right side
   105.15x = 10,997.27
5. Step 5: Solve for x
   x = 10,997.27/105.15
6. Step 6: Final answer
   x = 104.59