Finding the Fourth Proportional to 102.89, 141.94 and 67.91

Step by Step Solution

1. Step 1: Write the proportion equation
   102.89 : 141.94 = 67.91 : x
2. Step 2: Convert to fraction form
   102.89/141.94 = 67.91/x
3. Step 3: Cross multiply
   102.89x = 141.94 × 67.91
4. Step 4: Simplify right side
   102.89x = 9,639.15
5. Step 5: Solve for x
   x = 9,639.15/102.89
6. Step 6: Final answer
   x = 93.68