Finding the Fourth Proportional to 91.34, 136.82 and 42.63

Step by Step Solution

1. Step 1: Write the proportion equation
   91.34 : 136.82 = 42.63 : x
2. Step 2: Convert to fraction form
   91.34/136.82 = 42.63/x
3. Step 3: Cross multiply
   91.34x = 136.82 × 42.63
4. Step 4: Simplify right side
   91.34x = 5,832.42
5. Step 5: Solve for x
   x = 5,832.42/91.34
6. Step 6: Final answer
   x = 63.85