Finding the Fourth Proportional to 93.86, 139.82 and 89.18

Step by Step Solution

1. Step 1: Write the proportion equation
   93.86 : 139.82 = 89.18 : x
2. Step 2: Convert to fraction form
   93.86/139.82 = 89.18/x
3. Step 3: Cross multiply
   93.86x = 139.82 × 89.18
4. Step 4: Simplify right side
   93.86x = 12,469.15
5. Step 5: Solve for x
   x = 12,469.15/93.86
6. Step 6: Final answer
   x = 132.85