Finding the Fourth Proportional to 42.75, 59.00 and 31.09

Step by Step Solution

1. Step 1: Write the proportion equation
   42.75 : 59.00 = 31.09 : x
2. Step 2: Convert to fraction form
   42.75/59.00 = 31.09/x
3. Step 3: Cross multiply
   42.75x = 59.00 × 31.09
4. Step 4: Simplify right side
   42.75x = 1,834.46
5. Step 5: Solve for x
   x = 1,834.46/42.75
6. Step 6: Final answer
   x = 42.91