Finding the Fourth Proportional to 89.34, 134.04 and 76.64

Step by Step Solution

1. Step 1: Write the proportion equation
   89.34 : 134.04 = 76.64 : x
2. Step 2: Convert to fraction form
   89.34/134.04 = 76.64/x
3. Step 3: Cross multiply
   89.34x = 134.04 × 76.64
4. Step 4: Simplify right side
   89.34x = 10,272.83
5. Step 5: Solve for x
   x = 10,272.83/89.34
6. Step 6: Final answer
   x = 114.99