Finding the Fourth Proportional to 89.83, 134.56 and 53.18

Step by Step Solution

1. Step 1: Write the proportion equation
   89.83 : 134.56 = 53.18 : x
2. Step 2: Convert to fraction form
   89.83/134.56 = 53.18/x
3. Step 3: Cross multiply
   89.83x = 134.56 × 53.18
4. Step 4: Simplify right side
   89.83x = 7,155.23
5. Step 5: Solve for x
   x = 7,155.23/89.83
6. Step 6: Final answer
   x = 79.65