Finding the Fourth Proportional to 42.84, 64.31 and 42.71

Step by Step Solution

1. Step 1: Write the proportion equation
   42.84 : 64.31 = 42.71 : x
2. Step 2: Convert to fraction form
   42.84/64.31 = 42.71/x
3. Step 3: Cross multiply
   42.84x = 64.31 × 42.71
4. Step 4: Simplify right side
   42.84x = 2,746.15
5. Step 5: Solve for x
   x = 2,746.15/42.84
6. Step 6: Final answer
   x = 64.10