Finding the Fourth Proportional to 91.06, 136.63 and 42.96

Step by Step Solution

1. Step 1: Write the proportion equation
   91.06 : 136.63 = 42.96 : x
2. Step 2: Convert to fraction form
   91.06/136.63 = 42.96/x
3. Step 3: Cross multiply
   91.06x = 136.63 × 42.96
4. Step 4: Simplify right side
   91.06x = 5,869.62
5. Step 5: Solve for x
   x = 5,869.62/91.06
6. Step 6: Final answer
   x = 64.46