Finding the Fourth Proportional to 93.31, 128.52 and 81.02

Step by Step Solution

1. Step 1: Write the proportion equation
   93.31 : 128.52 = 81.02 : x
2. Step 2: Convert to fraction form
   93.31/128.52 = 81.02/x
3. Step 3: Cross multiply
   93.31x = 128.52 × 81.02
4. Step 4: Simplify right side
   93.31x = 10,413.01
5. Step 5: Solve for x
   x = 10,413.01/93.31
6. Step 6: Final answer
   x = 111.60