Finding the Fourth Proportional to 42.76, 63.59 and 42.31

Step by Step Solution

1. Step 1: Write the proportion equation
   42.76 : 63.59 = 42.31 : x
2. Step 2: Convert to fraction form
   42.76/63.59 = 42.31/x
3. Step 3: Cross multiply
   42.76x = 63.59 × 42.31
4. Step 4: Simplify right side
   42.76x = 2,690.49
5. Step 5: Solve for x
   x = 2,690.49/42.76
6. Step 6: Final answer
   x = 62.92