Finding the Fourth Proportional to 91.69, 137.55 and 43.57

Step by Step Solution

1. Step 1: Write the proportion equation
   91.69 : 137.55 = 43.57 : x
2. Step 2: Convert to fraction form
   91.69/137.55 = 43.57/x
3. Step 3: Cross multiply
   91.69x = 137.55 × 43.57
4. Step 4: Simplify right side
   91.69x = 5,993.05
5. Step 5: Solve for x
   x = 5,993.05/91.69
6. Step 6: Final answer
   x = 65.36