Finding the Fourth Proportional to 91.48, 137.22 and 42.72

Step by Step Solution

1. Step 1: Write the proportion equation
   91.48 : 137.22 = 42.72 : x
2. Step 2: Convert to fraction form
   91.48/137.22 = 42.72/x
3. Step 3: Cross multiply
   91.48x = 137.22 × 42.72
4. Step 4: Simplify right side
   91.48x = 5,861.65
5. Step 5: Solve for x
   x = 5,861.65/91.48
6. Step 6: Final answer
   x = 64.07