Finding the Fourth Proportional to 91.02, 136.56 and 42.96

Step by Step Solution

1. Step 1: Write the proportion equation
   91.02 : 136.56 = 42.96 : x
2. Step 2: Convert to fraction form
   91.02/136.56 = 42.96/x
3. Step 3: Cross multiply
   91.02x = 136.56 × 42.96
4. Step 4: Simplify right side
   91.02x = 5,866.62
5. Step 5: Solve for x
   x = 5,866.62/91.02
6. Step 6: Final answer
   x = 64.45