Finding the Fourth Proportional to 91.07, 136.61 and 42.95

Step by Step Solution

1. Step 1: Write the proportion equation
   91.07 : 136.61 = 42.95 : x
2. Step 2: Convert to fraction form
   91.07/136.61 = 42.95/x
3. Step 3: Cross multiply
   91.07x = 136.61 × 42.95
4. Step 4: Simplify right side
   91.07x = 5,866.50
5. Step 5: Solve for x
   x = 5,866.50/91.07
6. Step 6: Final answer
   x = 64.42