Finding the Fourth Proportional to 93.46, 128.89 and 65.86

Step by Step Solution

1. Step 1: Write the proportion equation
   93.46 : 128.89 = 65.86 : x
2. Step 2: Convert to fraction form
   93.46/128.89 = 65.86/x
3. Step 3: Cross multiply
   93.46x = 128.89 × 65.86
4. Step 4: Simplify right side
   93.46x = 8,487.72
5. Step 5: Solve for x
   x = 8,487.72/93.46
6. Step 6: Final answer
   x = 90.82