Finding the Fourth Proportional to 92.89, 128.31 and 71.33

Step by Step Solution

1. Step 1: Write the proportion equation
   92.89 : 128.31 = 71.33 : x
2. Step 2: Convert to fraction form
   92.89/128.31 = 71.33/x
3. Step 3: Cross multiply
   92.89x = 128.31 × 71.33
4. Step 4: Simplify right side
   92.89x = 9,151.71
5. Step 5: Solve for x
   x = 9,151.71/92.89
6. Step 6: Final answer
   x = 98.52