Finding the Fourth Proportional to 89.10, 134.46 and 89.10

Step by Step Solution

1. Step 1: Write the proportion equation
   89.10 : 134.46 = 89.10 : x
2. Step 2: Convert to fraction form
   89.10/134.46 = 89.10/x
3. Step 3: Cross multiply
   89.10x = 134.46 × 89.10
4. Step 4: Simplify right side
   89.10x = 11,980.39
5. Step 5: Solve for x
   x = 11,980.39/89.10
6. Step 6: Final answer
   x = 134.46