Finding the Fourth Proportional to 89.81, 124.15 and 85.98

Step by Step Solution

1. Step 1: Write the proportion equation
   89.81 : 124.15 = 85.98 : x
2. Step 2: Convert to fraction form
   89.81/124.15 = 85.98/x
3. Step 3: Cross multiply
   89.81x = 124.15 × 85.98
4. Step 4: Simplify right side
   89.81x = 10,674.42
5. Step 5: Solve for x
   x = 10,674.42/89.81
6. Step 6: Final answer
   x = 118.86