Finding the Fourth Proportional to 89.41, 123.30 and 58.31

Step by Step Solution

1. Step 1: Write the proportion equation
   89.41 : 123.30 = 58.31 : x
2. Step 2: Convert to fraction form
   89.41/123.30 = 58.31/x
3. Step 3: Cross multiply
   89.41x = 123.30 × 58.31
4. Step 4: Simplify right side
   89.41x = 7,189.55
5. Step 5: Solve for x
   x = 7,189.55/89.41
6. Step 6: Final answer
   x = 80.41