Finding the Fourth Proportional to 105.89, 146.01 and 70.91

Step by Step Solution

1. Step 1: Write the proportion equation
   105.89 : 146.01 = 70.91 : x
2. Step 2: Convert to fraction form
   105.89/146.01 = 70.91/x
3. Step 3: Cross multiply
   105.89x = 146.01 × 70.91
4. Step 4: Simplify right side
   105.89x = 10,353.93
5. Step 5: Solve for x
   x = 10,353.93/105.89
6. Step 6: Final answer
   x = 97.78