Finding the Fourth Proportional to 91.69, 137.54 and 43.59

Step by Step Solution

1. Step 1: Write the proportion equation
   91.69 : 137.54 = 43.59 : x
2. Step 2: Convert to fraction form
   91.69/137.54 = 43.59/x
3. Step 3: Cross multiply
   91.69x = 137.54 × 43.59
4. Step 4: Simplify right side
   91.69x = 5,995.37
5. Step 5: Solve for x
   x = 5,995.37/91.69
6. Step 6: Final answer
   x = 65.39