Finding the Fourth Proportional to 42.71, 64.10 and 42.37

Step by Step Solution

1. Step 1: Write the proportion equation
   42.71 : 64.10 = 42.37 : x
2. Step 2: Convert to fraction form
   42.71/64.10 = 42.37/x
3. Step 3: Cross multiply
   42.71x = 64.10 × 42.37
4. Step 4: Simplify right side
   42.71x = 2,715.71
5. Step 5: Solve for x
   x = 2,715.71/42.71
6. Step 6: Final answer
   x = 63.58