Finding the Fourth Proportional to 45.39, 68.01 and 42.71

Step by Step Solution

1. Step 1: Write the proportion equation
   45.39 : 68.01 = 42.71 : x
2. Step 2: Convert to fraction form
   45.39/68.01 = 42.71/x
3. Step 3: Cross multiply
   45.39x = 68.01 × 42.71
4. Step 4: Simplify right side
   45.39x = 2,904.37
5. Step 5: Solve for x
   x = 2,904.37/45.39
6. Step 6: Final answer
   x = 63.99