Finding the Fourth Proportional to 89.72, 123.82 and 87.08

Step by Step Solution

1. Step 1: Write the proportion equation
   89.72 : 123.82 = 87.08 : x
2. Step 2: Convert to fraction form
   89.72/123.82 = 87.08/x
3. Step 3: Cross multiply
   89.72x = 123.82 × 87.08
4. Step 4: Simplify right side
   89.72x = 10,782.25
5. Step 5: Solve for x
   x = 10,782.25/89.72
6. Step 6: Final answer
   x = 120.18