Finding the Fourth Proportional to 42.76, 63.99 and 31.29

Step by Step Solution

1. Step 1: Write the proportion equation
   42.76 : 63.99 = 31.29 : x
2. Step 2: Convert to fraction form
   42.76/63.99 = 31.29/x
3. Step 3: Cross multiply
   42.76x = 63.99 × 31.29
4. Step 4: Simplify right side
   42.76x = 2,002.01
5. Step 5: Solve for x
   x = 2,002.01/42.76
6. Step 6: Final answer
   x = 46.82