Finding the Fourth Proportional to 89.71, 133.99 and 82.82

Step by Step Solution

1. Step 1: Write the proportion equation
   89.71 : 133.99 = 82.82 : x
2. Step 2: Convert to fraction form
   89.71/133.99 = 82.82/x
3. Step 3: Cross multiply
   89.71x = 133.99 × 82.82
4. Step 4: Simplify right side
   89.71x = 11,097.18
5. Step 5: Solve for x
   x = 11,097.18/89.71
6. Step 6: Final answer
   x = 123.70