Finding the Fourth Proportional to 89.75, 123.81 and 67.91

Step by Step Solution

1. Step 1: Write the proportion equation
   89.75 : 123.81 = 67.91 : x
2. Step 2: Convert to fraction form
   89.75/123.81 = 67.91/x
3. Step 3: Cross multiply
   89.75x = 123.81 × 67.91
4. Step 4: Simplify right side
   89.75x = 8,407.94
5. Step 5: Solve for x
   x = 8,407.94/89.75
6. Step 6: Final answer
   x = 93.68