Finding the Fourth Proportional to 91.55, 137.35 and 43.45

Step by Step Solution

1. Step 1: Write the proportion equation
   91.55 : 137.35 = 43.45 : x
2. Step 2: Convert to fraction form
   91.55/137.35 = 43.45/x
3. Step 3: Cross multiply
   91.55x = 137.35 × 43.45
4. Step 4: Simplify right side
   91.55x = 5,968.10
5. Step 5: Solve for x
   x = 5,968.10/91.55
6. Step 6: Final answer
   x = 65.19