Finding the Fourth Proportional to 42.83, 64.06 and 31.28

Step by Step Solution

1. Step 1: Write the proportion equation
   42.83 : 64.06 = 31.28 : x
2. Step 2: Convert to fraction form
   42.83/64.06 = 31.28/x
3. Step 3: Cross multiply
   42.83x = 64.06 × 31.28
4. Step 4: Simplify right side
   42.83x = 2,003.88
5. Step 5: Solve for x
   x = 2,003.88/42.83
6. Step 6: Final answer
   x = 46.79