Finding the Fourth Proportional to 89.20, 123.16 and 58.18

Step by Step Solution

1. Step 1: Write the proportion equation
   89.20 : 123.16 = 58.18 : x
2. Step 2: Convert to fraction form
   89.20/123.16 = 58.18/x
3. Step 3: Cross multiply
   89.20x = 123.16 × 58.18
4. Step 4: Simplify right side
   89.20x = 7,164.83
5. Step 5: Solve for x
   x = 7,164.83/89.20
6. Step 6: Final answer
   x = 80.33