Finding the Fourth Proportional to 89.00, 133.69 and 54.78

Step by Step Solution

1. Step 1: Write the proportion equation
   89.00 : 133.69 = 54.78 : x
2. Step 2: Convert to fraction form
   89.00/133.69 = 54.78/x
3. Step 3: Cross multiply
   89.00x = 133.69 × 54.78
4. Step 4: Simplify right side
   89.00x = 7,323.40
5. Step 5: Solve for x
   x = 7,323.40/89.00
6. Step 6: Final answer
   x = 82.29