Finding the Fourth Proportional to 89.18, 123.07 and 67.31

Step by Step Solution

1. Step 1: Write the proportion equation
   89.18 : 123.07 = 67.31 : x
2. Step 2: Convert to fraction form
   89.18/123.07 = 67.31/x
3. Step 3: Cross multiply
   89.18x = 123.07 × 67.31
4. Step 4: Simplify right side
   89.18x = 8,284.34
5. Step 5: Solve for x
   x = 8,284.34/89.18
6. Step 6: Final answer
   x = 92.89