Finding the Fourth Proportional to 91.08, 124.89 and 86.04

Step by Step Solution

1. Step 1: Write the proportion equation
   91.08 : 124.89 = 86.04 : x
2. Step 2: Convert to fraction form
   91.08/124.89 = 86.04/x
3. Step 3: Cross multiply
   91.08x = 124.89 × 86.04
4. Step 4: Simplify right side
   91.08x = 10,745.54
5. Step 5: Solve for x
   x = 10,745.54/91.08
6. Step 6: Final answer
   x = 117.98