Finding the Fourth Proportional to 89.21, 133.82 and 53.06

Step by Step Solution

1. Step 1: Write the proportion equation
   89.21 : 133.82 = 53.06 : x
2. Step 2: Convert to fraction form
   89.21/133.82 = 53.06/x
3. Step 3: Cross multiply
   89.21x = 133.82 × 53.06
4. Step 4: Simplify right side
   89.21x = 7,100.96
5. Step 5: Solve for x
   x = 7,100.96/89.21
6. Step 6: Final answer
   x = 79.60