Finding the Fourth Proportional to 89.74, 123.56 and 86.98

Step by Step Solution

1. Step 1: Write the proportion equation
   89.74 : 123.56 = 86.98 : x
2. Step 2: Convert to fraction form
   89.74/123.56 = 86.98/x
3. Step 3: Cross multiply
   89.74x = 123.56 × 86.98
4. Step 4: Simplify right side
   89.74x = 10,747.25
5. Step 5: Solve for x
   x = 10,747.25/89.74
6. Step 6: Final answer
   x = 119.76