Finding the Fourth Proportional to 91.34, 136.94 and 42.56

Step by Step Solution

1. Step 1: Write the proportion equation
   91.34 : 136.94 = 42.56 : x
2. Step 2: Convert to fraction form
   91.34/136.94 = 42.56/x
3. Step 3: Cross multiply
   91.34x = 136.94 × 42.56
4. Step 4: Simplify right side
   91.34x = 5,828.17
5. Step 5: Solve for x
   x = 5,828.17/91.34
6. Step 6: Final answer
   x = 63.81