Finding the Fourth Proportional to 89.81, 123.89 and 58.71

Step by Step Solution

1. Step 1: Write the proportion equation
   89.81 : 123.89 = 58.71 : x
2. Step 2: Convert to fraction form
   89.81/123.89 = 58.71/x
3. Step 3: Cross multiply
   89.81x = 123.89 × 58.71
4. Step 4: Simplify right side
   89.81x = 7,273.73
5. Step 5: Solve for x
   x = 7,273.73/89.81
6. Step 6: Final answer
   x = 80.99