Finding the Fourth Proportional to 91.05, 136.61 and 42.35

Step by Step Solution

1. Step 1: Write the proportion equation
   91.05 : 136.61 = 42.35 : x
2. Step 2: Convert to fraction form
   91.05/136.61 = 42.35/x
3. Step 3: Cross multiply
   91.05x = 136.61 × 42.35
4. Step 4: Simplify right side
   91.05x = 5,784.54
5. Step 5: Solve for x
   x = 5,784.54/91.05
6. Step 6: Final answer
   x = 63.53