Finding the Fourth Proportional to 89.34, 133.83 and 71.09

Step by Step Solution

1. Step 1: Write the proportion equation
   89.34 : 133.83 = 71.09 : x
2. Step 2: Convert to fraction form
   89.34/133.83 = 71.09/x
3. Step 3: Cross multiply
   89.34x = 133.83 × 71.09
4. Step 4: Simplify right side
   89.34x = 9,514.31
5. Step 5: Solve for x
   x = 9,514.31/89.34
6. Step 6: Final answer
   x = 106.50