Finding the Fourth Proportional to 93.24, 128.72 and 89.37

Step by Step Solution

1. Step 1: Write the proportion equation
   93.24 : 128.72 = 89.37 : x
2. Step 2: Convert to fraction form
   93.24/128.72 = 89.37/x
3. Step 3: Cross multiply
   93.24x = 128.72 × 89.37
4. Step 4: Simplify right side
   93.24x = 11,503.71
5. Step 5: Solve for x
   x = 11,503.71/93.24
6. Step 6: Final answer
   x = 123.38