Finding the Fourth Proportional to 109.89, 151.82 and 103.05

Step by Step Solution

1. Step 1: Write the proportion equation
   109.89 : 151.82 = 103.05 : x
2. Step 2: Convert to fraction form
   109.89/151.82 = 103.05/x
3. Step 3: Cross multiply
   109.89x = 151.82 × 103.05
4. Step 4: Simplify right side
   109.89x = 15,645.05
5. Step 5: Solve for x
   x = 15,645.05/109.89
6. Step 6: Final answer
   x = 142.37