Finding the Fourth Proportional to 91.68, 137.59 and 43.59

Step by Step Solution

1. Step 1: Write the proportion equation
   91.68 : 137.59 = 43.59 : x
2. Step 2: Convert to fraction form
   91.68/137.59 = 43.59/x
3. Step 3: Cross multiply
   91.68x = 137.59 × 43.59
4. Step 4: Simplify right side
   91.68x = 5,997.87
5. Step 5: Solve for x
   x = 5,997.87/91.68
6. Step 6: Final answer
   x = 65.42