Finding the Fourth Proportional to 91.14, 136.50 and 42.96

Step by Step Solution

1. Step 1: Write the proportion equation
   91.14 : 136.50 = 42.96 : x
2. Step 2: Convert to fraction form
   91.14/136.50 = 42.96/x
3. Step 3: Cross multiply
   91.14x = 136.50 × 42.96
4. Step 4: Simplify right side
   91.14x = 5,864.04
5. Step 5: Solve for x
   x = 5,864.04/91.14
6. Step 6: Final answer
   x = 64.34