Finding the Fourth Proportional to 89.07, 133.50 and 43.31

Step by Step Solution

1. Step 1: Write the proportion equation
   89.07 : 133.50 = 43.31 : x
2. Step 2: Convert to fraction form
   89.07/133.50 = 43.31/x
3. Step 3: Cross multiply
   89.07x = 133.50 × 43.31
4. Step 4: Simplify right side
   89.07x = 5,781.89
5. Step 5: Solve for x
   x = 5,781.89/89.07
6. Step 6: Final answer
   x = 64.91