Finding the Fourth Proportional to 91.59, 137.44 and 43.50

Step by Step Solution

1. Step 1: Write the proportion equation
   91.59 : 137.44 = 43.50 : x
2. Step 2: Convert to fraction form
   91.59/137.44 = 43.50/x
3. Step 3: Cross multiply
   91.59x = 137.44 × 43.50
4. Step 4: Simplify right side
   91.59x = 5,978.64
5. Step 5: Solve for x
   x = 5,978.64/91.59
6. Step 6: Final answer
   x = 65.28