Finding the Fourth Proportional to 105.98, 145.31 and 95.57

Step by Step Solution

1. Step 1: Write the proportion equation
   105.98 : 145.31 = 95.57 : x
2. Step 2: Convert to fraction form
   105.98/145.31 = 95.57/x
3. Step 3: Cross multiply
   105.98x = 145.31 × 95.57
4. Step 4: Simplify right side
   105.98x = 13,887.52
5. Step 5: Solve for x
   x = 13,887.52/105.98
6. Step 6: Final answer
   x = 131.05