Finding the Fourth Proportional to 94.05, 140.72 and 89.10

Step by Step Solution

1. Step 1: Write the proportion equation
   94.05 : 140.72 = 89.10 : x
2. Step 2: Convert to fraction form
   94.05/140.72 = 89.10/x
3. Step 3: Cross multiply
   94.05x = 140.72 × 89.10
4. Step 4: Simplify right side
   94.05x = 12,537.71
5. Step 5: Solve for x
   x = 12,537.71/94.05
6. Step 6: Final answer
   x = 133.31