Finding the Fourth Proportional to 89.31, 133.71 and 56.73

Step by Step Solution

1. Step 1: Write the proportion equation
   89.31 : 133.71 = 56.73 : x
2. Step 2: Convert to fraction form
   89.31/133.71 = 56.73/x
3. Step 3: Cross multiply
   89.31x = 133.71 × 56.73
4. Step 4: Simplify right side
   89.31x = 7,585.31
5. Step 5: Solve for x
   x = 7,585.31/89.31
6. Step 6: Final answer
   x = 84.93