Finding the Fourth Proportional to 42.67, 64.01 and 42.17

Step by Step Solution

1. Step 1: Write the proportion equation
   42.67 : 64.01 = 42.17 : x
2. Step 2: Convert to fraction form
   42.67/64.01 = 42.17/x
3. Step 3: Cross multiply
   42.67x = 64.01 × 42.17
4. Step 4: Simplify right side
   42.67x = 2,699.30
5. Step 5: Solve for x
   x = 2,699.30/42.67
6. Step 6: Final answer
   x = 63.26