Finding the Fourth Proportional to 42.76, 64.51 and 42.68

Step by Step Solution

1. Step 1: Write the proportion equation
   42.76 : 64.51 = 42.68 : x
2. Step 2: Convert to fraction form
   42.76/64.51 = 42.68/x
3. Step 3: Cross multiply
   42.76x = 64.51 × 42.68
4. Step 4: Simplify right side
   42.76x = 2,753.29
5. Step 5: Solve for x
   x = 2,753.29/42.76
6. Step 6: Final answer
   x = 64.39