Finding the Fourth Proportional to 89.16, 123.06 and 71.73

Step by Step Solution

1. Step 1: Write the proportion equation
   89.16 : 123.06 = 71.73 : x
2. Step 2: Convert to fraction form
   89.16/123.06 = 71.73/x
3. Step 3: Cross multiply
   89.16x = 123.06 × 71.73
4. Step 4: Simplify right side
   89.16x = 8,827.09
5. Step 5: Solve for x
   x = 8,827.09/89.16
6. Step 6: Final answer
   x = 99.00