Finding the Fourth Proportional to 158.52, 218.72 and 89.52

Step by Step Solution

1. Step 1: Write the proportion equation
   158.52 : 218.72 = 89.52 : x
2. Step 2: Convert to fraction form
   158.52/218.72 = 89.52/x
3. Step 3: Cross multiply
   158.52x = 218.72 × 89.52
4. Step 4: Simplify right side
   158.52x = 19,579.81
5. Step 5: Solve for x
   x = 19,579.81/158.52
6. Step 6: Final answer
   x = 123.52