Finding the Fourth Proportional to 105.53, 145.55 and 83.41

Step by Step Solution

1. Step 1: Write the proportion equation
   105.53 : 145.55 = 83.41 : x
2. Step 2: Convert to fraction form
   105.53/145.55 = 83.41/x
3. Step 3: Cross multiply
   105.53x = 145.55 × 83.41
4. Step 4: Simplify right side
   105.53x = 12,140.17
5. Step 5: Solve for x
   x = 12,140.17/105.53
6. Step 6: Final answer
   x = 115.05