Finding the Fourth Proportional to 89.29, 133.89 and 52.78

Step by Step Solution

1. Step 1: Write the proportion equation
   89.29 : 133.89 = 52.78 : x
2. Step 2: Convert to fraction form
   89.29/133.89 = 52.78/x
3. Step 3: Cross multiply
   89.29x = 133.89 × 52.78
4. Step 4: Simplify right side
   89.29x = 7,066.71
5. Step 5: Solve for x
   x = 7,066.71/89.29
6. Step 6: Final answer
   x = 79.14