Finding the Fourth Proportional to 141.98, 195.90 and 105.15

Step by Step Solution

1. Step 1: Write the proportion equation
   141.98 : 195.90 = 105.15 : x
2. Step 2: Convert to fraction form
   141.98/195.90 = 105.15/x
3. Step 3: Cross multiply
   141.98x = 195.90 × 105.15
4. Step 4: Simplify right side
   141.98x = 20,598.89
5. Step 5: Solve for x
   x = 20,598.89/141.98
6. Step 6: Final answer
   x = 145.09