Finding the Fourth Proportional to 89.31, 123.17 and 58.23

Step by Step Solution

1. Step 1: Write the proportion equation
   89.31 : 123.17 = 58.23 : x
2. Step 2: Convert to fraction form
   89.31/123.17 = 58.23/x
3. Step 3: Cross multiply
   89.31x = 123.17 × 58.23
4. Step 4: Simplify right side
   89.31x = 7,172.19
5. Step 5: Solve for x
   x = 7,172.19/89.31
6. Step 6: Final answer
   x = 80.31