Finding the Fourth Proportional to 89.82, 134.61 and 78.36

Step by Step Solution

1. Step 1: Write the proportion equation
   89.82 : 134.61 = 78.36 : x
2. Step 2: Convert to fraction form
   89.82/134.61 = 78.36/x
3. Step 3: Cross multiply
   89.82x = 134.61 × 78.36
4. Step 4: Simplify right side
   89.82x = 10,548.04
5. Step 5: Solve for x
   x = 10,548.04/89.82
6. Step 6: Final answer
   x = 117.44