Finding the Fourth Proportional to 89.31, 133.76 and 53.16

Step by Step Solution

1. Step 1: Write the proportion equation
   89.31 : 133.76 = 53.16 : x
2. Step 2: Convert to fraction form
   89.31/133.76 = 53.16/x
3. Step 3: Cross multiply
   89.31x = 133.76 × 53.16
4. Step 4: Simplify right side
   89.31x = 7,110.42
5. Step 5: Solve for x
   x = 7,110.42/89.31
6. Step 6: Final answer
   x = 79.62