Finding the Fourth Proportional to 90.96, 136.56 and 90.96

Step by Step Solution

1. Step 1: Write the proportion equation
   90.96 : 136.56 = 90.96 : x
2. Step 2: Convert to fraction form
   90.96/136.56 = 90.96/x
3. Step 3: Cross multiply
   90.96x = 136.56 × 90.96
4. Step 4: Simplify right side
   90.96x = 12,421.50
5. Step 5: Solve for x
   x = 12,421.50/90.96
6. Step 6: Final answer
   x = 136.56